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Talk:Cuboid

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84: 74: 53: 417:... in saying that according to the definitions given on the main page, a square cuboid is not a special case of a rectangular cuboid since the former may have 4 faces which are not rectangles, whereas the latter has all faces rectangles ? If so, is this definition of a square cuboid intended, or should a square cuboid be defined as a cuboid in which all faces are rectangles and at least 2 are squares - i.e. a rectangular cuboid of which at least 2 faces are squares ? 22: 300:, and inspected by non-technical users who want to know if we're ruling out a 10-faced box (its interior is the union of two truncated square pyramids) that might have a fast-food burger in it, or a cylindrical one with 3 pounds of Quaker-brand oatmeal. To see that this is not hypothetical, sample the articles that 853:
From skimming around, the name "hexahedron" seems to usually refer to the quadrilateral-faced topological cube rather than other 6-faced polyhedra, and seems much much more common for this than "cuboid". Apparently in finite element literature it's called a "brick". Edit: after more skimming, I would
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Please provide evidence that this phrase is actually in common usage. I can only find a handful of hits for it in Google Scholar, several of which immediately clarify what they mean by writing "quadrilaterally-faced hexahedron (cuboid)". The fact that this name is also used for a different meaning is
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The article you reference doi:10.1007/BF03026511 could be introducing its own local definition for its own purpose, "Suppose that we call a polyhedron a cuboid iff it is combinatorially equivalent to a cube." That, to me, seems to fall short of being a claim that this is what is generally accepted to
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Everywhere I look, including the sources and references on this article say a cuboid is rectangular. Its faces are rectangles (more specific than merely 'quadrilaterals' as stated). And therefore NO, a rectangular cuboid is not a special case of cuboid -- a cuboid is ALREADY rectangular, and then NO
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A closed box composed of three pairs of rectangular faces placed opposite each other and joined at right angles to each other, also known as a rectangular parallelepiped. The cuboid is also a right prism, a special case of the parallelepiped, and corresponds to what in everyday parlance is known as a
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It needs some justification of the logic of "shortest": what assumption is involved as to, e.g., ratio between time do multiplications and addtiongs, and what is the domain where that matters? This isn't an optimum-computation manual, and the effort of remembering a less intuitive formula is unlikely
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The article for rectangular cuboid says "These are often called "cuboids", without qualifying them as being rectangular, but a cuboid can also refer to a more general class of polyhedra, with six quadrilateral faces" -- that's a really weak statement; that fails to reflect that MOST sources actually
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I took higher level math, and I check it on the Mathworld website.... The statement about "rectangular parallelepiped " is correct, I should be added. The current description is too "dumbed down". A Cubiod is rather technical in and of its self, therefore having the discription equally technical is
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So what other word do you use for the actual topic of this article, the shapes that are combinatorially equivalent to cubes but not required to have rectangular sides? It is clear that some people use "cuboid" in the restricted sense that you mean. It is also clear that some people use "cuboid" for
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Galleries can reflow to fit narrower windows (only wide enough for 2-wide images, for instance). Wikitables cannot. Therefore for this sort of use galleries are preferable to windows. Wide tables are going to cause undesirable sidescrolling. Your table sidescrolls even on my laptop screen. Please
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2) The disambiguation page for Cuboid doesn't include 'rectangular cuboid' despite that being the article most people would actually be looking for. When you search for cat, both the article for the domestic house cat, and the larger family of cats including lions and tigers are included in the
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You seem to be under the impression that a square is not a rectangle. While there is some support for that position in the literature, I don't think it's a helpful point of view. A square is a special kind of rectangle, but it is still a rectangle. The square cuboid's square faces are also
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about "cuboid" is useful mainly to associate the word with its meaning. So, for Knowledge, the importance of the article is relevant here, not the importance of the subject. Still, since cuboids are definitely of more than specialist interest, I give this article "Medium" importance.
785:. I'm not sure what the right title is for the subject of this current article under discussion. Is it really even notable as a concept? Are there other authors beyond Robertson who have anything meaningful to say about it? It could probably just be merged as a section of 729:
I don't really have an issue with this article 'existing' per se. And I don't really have an issue with this article being called cuboid, if that's the common term applied to the class of shapes here, if this class of objects is referenced often enough to deserve its own
372:"A cuboid with integer edges as well as integer face diagonals is called an Euler brick, for example with sides 44, 117 and 240. A perfect cuboid is an Euler brick whose space diagonal is also an integer. It is currently unknown whether a perfect cuboid actually exists." 854:
say that the relevance to "hexahedral mesh" construction is the main reason this shape is notable, and by far dominates all of the research literature ever mentioning it. If there's going to be an article about this, it should maybe focus on that topic. –
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Sorry but in fact, a square cuboid must have AT MOST 2 square faces. The other 4 faces can be equal sized rectangles. e.g. the rectangles can measure 6cm on each length and 2cm in width therefore having the two square faces measuring 2cm on each side.
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I don't think it was bcz i was on drugs tho it would make more sense than what i remember, but i think it's wrong, bcz "rectangular" does not (for a solid figure) imply all faces. "Right rectangular prism", but i'm not sure we should bother with
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Also, hang on, that's the same Robertson -- that makes it especially interesting to me what he said in "Polytopes and Symmetry"; what does he say in polytopes and symmetry? Do you have access to that reference? can you share what it actually
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3) Yes I know wikipedia is not a dictionary; and I understand your point - but you have one source using cuboids for quadrilateral polyhedra and one source saying those non-rectangular solids are NOT cuboids - that disagreement needs to be
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It rarely shows with mobile edit tags, but when I edit Knowledge, I almost always do it on my (rather big) smartphone (with which I often use the PC version of Knowledge), where tables are automatically adjusted to the width of the
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I could see how the article might expand from there that there are these other more exotic shapes that are sometimes also classed as cuboids, and when cuboid is used in that context then the usual 'cuboid' is a 'rectangular
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4 - Roberston - to me, that looks a LOT like Branko, where he literally says in a paper "Suppose that we call cuboids". I think he's appropriating the term to talk about a more general class (which is the subject of the
695:, again. Dictionary articles are about words and their meanings. Encyclopedia articles are primarily about the things described in those articles, and to a much lesser extent about the words used to name those articles. — 649:
You say "what is relevant is what name is in common usage for this meaning". Well, what mathematical name is in common usage for things are ONLY rectangular boxes and not parellelepides and frustrums? Isn't that name:
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Those are the mathematically defining criteria for what a shape needs to be to be a cuboid; and then wikipedia directly contradicts that and says that cuboids can have any quadrilateral shaped face at any
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cuboid is technical (you can minor in math and not know it), but this is not a dictionary, and the article is not about the technical word "cuboid", but about the sometimes technical, sometimes simplistic
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Pardon me for being stupid, but is a square cuboid not only one square face? If it has two square faces then does its conjunction on each edge not require that the third is therefore also a square?
691:. That is not the subject of this article. This article is about the things you want to call quadrilateral-faced hexahedra. Regardless of the name, the subject of the article is what it is. See 308:
I've no objection to including good rigorous material, but do bear in mind that the straight-forward stuff needs to be there too. None of these articles belong exclusively to the specialists.
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If we consider that the parallelepiped is also cuboid based on another source, fine, but then shouldn't the fact that the source materials are in direct opposition, itself, be made apparent?
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of cuboid. Its only really suitable name (adequately precise and adequately brief) is "cuboid", but the technical sound of that word is a red herring: piping means it can be lk-ed via
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be called a cuboid, and more of a 'lets call these solids cuboids as a convenient shorthand for our purpose here'. Is there a more authoritative source or more consensus on that usage?
663:"If the three sections are rectangles, all the faces are rectangles, and all the dihedral angles are right angles, and all the corners are right corners The figure is then a cuboid" 558:
If the three sections are rectangles, all the faces are rectangles, and all the dihedral angles are right angles, and all the corners are right corners The figure is then a cuboid.
609:) are co-labelled "Quadrilaterally-faced hexahedron" which seems unambiguous, precise, and correct. It refers to no other polyhedra, and leaves none of the ones in the table out. 765:
In doing a search, this use of the name 'cuboid' seems to be very rare. The only source I can find by an author other than Robertson, who seems to have coined this usage, is one
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A year or two ago I was looking for an english word for the notion "rectangular box" and was surprised to find such a modest article. Cuboids are so common in life that the
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Additionally, because it is so wide, the table overlays the toolbar in my right margin (it goes past the margin and off the screen), blocking the use of the tools. —
180:"The square cuboid, square box or right square prism (also ambiguously called square prism) is a special case of the cuboid in which at least two faces are squares." 769:. By contrast, I can easily find hundreds of examples of sources using 'cuboid' to mean a rectangular parallelepiped. I'd recommend putting the disambiguation page 505:
However, because cuboids are so commonplace, many people just know its important properties and do not need an encyclopedia to look them up. In this regard, the
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I'm not sure I understand your technical suggestion; but of course, you can try it (as long as it shows as much information as the present table does, please). —
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Another phrase that appears to describe the six-quadrilateral shapes in some literature is "combinatorial cube", although that also has other meanings. See e.g.
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As for what other word to use for the shapes in the table in this article. Both the table on this page and the same table on the more general hexahedron page (
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Judging from its age, the amount of edits, and my own impression, the article meets the important demands. Therefore I deem it a Start rather than a Stub. --
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Each face of a cuboid is identical to the opposite face. This means a square cuboid must have "at least" 2 square faces, and it must be an even number.
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There are plenty of examples of "cuboid" being used in the general sense in the scientific computing / finite element meshing literature. For example:
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1) This article on 'cuboid' cites a reference that says the subject matter of this article are NOT cuboids, surely that should be called out somehow?
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Care to sign your post (;-)? The sentence in the article is correct. Hint: A cuboid has six faces. But you are thinking along the right line (:-). --
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DEFINE cuboid to REQUIRE them to be rectangular, and that the more general class of polyhedra according to those sources would NOT be cuboids.
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If a square cuboid has 4 square faces, then the other 2 faces must also be square, and the "square cuboid" is actually a cube in that case.
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It would be more flexible if transposed; as is, it's wider than my window, and adding/removing an entry will be prone to errors.
766: 470:, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section. 715:
2 - Branko - cited as re-using the word cuboid to talk about a more general class of polytopes expanded into higher dimensions.
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And shouldn't the FAR more common meaning of cuboid -- that of being a box and only being a box, be more clear and prominent?
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because this article otherwise has nothing to do with higher dimensions, and even less with hyperbolic space! I'll add
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I'll set aside what to call quadrilateral faced hexahedra aside for a moment; because that's not really my issue.
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Interestingly the line I quoted from rectangular cuboid again a cites back to the same 1984 Robertson text.
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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I think the words length and area are missing. But it is not my field so I have not changed it
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disambiguation page. Not so here. Only this article is returned. I think that's also an issue.
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increases the vertices by a multiplication of two. With 8 vertices a cube, 16 vertices a
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And the text book citation on this article, to Elements of Synthetic Solid Geometry
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This didn't make any sense to me (a lowly Physicist) until I followed the link.
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irrelevant; what is relevant is what name is in common use for this meaning. See
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Last edited at 20:09, 21 June 2007 (UTC). Substituted at 01:56, 5 May 2016 (UTC)
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The Cuboid definition at wolfram alpha, which is linked to from this page says:
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Extremely important, even crucial, to its field, and very significant beyond it.
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1 - Robertson, I can't find it online. I'd love to see what it actually says.
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https://archive.org/details/elementssynthet01dupugoog/page/n68/mode/2up
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The article cites a page from textbook on solid geometry; and it says:
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We have an article about the things you want to call cuboids. It is
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rectangles, and the square cuboid is also a rectangular cuboid. —
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a frustrum, rhombohedron, parallelepiped, etc are NOT cuboids.
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Replaced gallery with wikitable (...): much more flexible.
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Being a cube doesn't stop it from also being a cuboid. —
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I agree that this is off-topic and should be removed. —
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Brouwer, Andries; Dejter, Italo; Thomassen, Carsten.
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I prefer galleries in this case, instead of tables.
101:, a collaborative effort to improve the coverage of 718:3 - Dupuis - says a cuboid MUST be rectangular. 466:, and are posted here for posterity. Following 563:It too requires that a cuboid is rectangular. 460:The comment(s) below were originally left at 397:An edge or a diagonal has length, not area. — 8: 332:, or in a shortest calculation, 2(a+b)h+ab. 19: 1013:"Highly Symmetric Subgraphs of Hypercubes" 495:fits the definition of "Top Importance": 472: 47: 653:Shouldn't that be clear from the article? 343:The h is undefined, but h=c would fix it 1003: 534:Is this whole article completely wrong? 351:Let's hear what they have in mind here. 49: 938: 934:I'm going to remove this new passage: 7: 1032:"On the cut-complexes of the 5-cube" 1017:Journal of Algebraic Combinatorics 2 95:This article is within the scope of 975:of vertices as dimensions increase. 607:https://en.wikipedia.org/Hexahedron 38:It is of interest to the following 823:(see for instance figs. 6 & 7) 14: 1187:Mid-priority mathematics articles 583:the more general shape (example: 468:several discussions in past years 115:Knowledge:WikiProject Mathematics 1182:Start-Class mathematics articles 804:Zienkiewicz & Phillips 1971 118:Template:WikiProject Mathematics 82: 72: 51: 20: 135:This article has been rated as 1: 890:. Also, "combinatorial box": 709:This article has 4 citations: 450:19:12, 27 November 2013 (UTC) 433:18:58, 27 November 2013 (UTC) 391:09:40, 5 September 2011 (UTC) 109:and see a list of open tasks. 896:10.1007/978-94-011-5020-0_19 832:10.1016/0097-8493(95)00099-2 407:04:11, 11 October 2011 (UTC) 340:They must mean "2((a+b)h+ab) 227:15:39, 2 October 2013 (UTC) 204:10:15, 2 October 2013 (UTC) 1203: 1030:M.R. Emany-K; L. Lazarte. 973:exponential multiplication 1161:04:16, 18 July 2024 (UTC) 908:08:00, 5 March 2024 (UTC) 862:02:12, 5 March 2024 (UTC) 849:01:40, 5 March 2024 (UTC) 812:(see for instance fig. 7) 797:23:35, 4 March 2024 (UTC) 761:22:18, 4 March 2024 (UTC) 705:06:19, 2 March 2024 (UTC) 683:02:42, 2 March 2024 (UTC) 642:00:03, 2 March 2024 (UTC) 619:23:06, 1 March 2024 (UTC) 597:19:12, 1 March 2024 (UTC) 577:18:35, 1 March 2024 (UTC) 523:20:09, 21 June 2007 (UTC) 515:19:59, 21 June 2007 (UTC) 483: 361:05:36, 16 Jun 2005 (UTC) 171:06:36, 23 July 2007 (UTC) 134: 67: 46: 1147:20:16, 14 May 2024 (UTC) 1133:19:35, 14 May 2024 (UTC) 1118:19:23, 14 May 2024 (UTC) 1099:17:27, 14 May 2024 (UTC) 945:higher-dimensional space 777:, and possibly renaming 733:My issues here are that: 488:22:08, 22 May 2007 (UTC) 275:17:25, 27 May 2005 (UTC) 245:It can also be called a 141:project's priority scale 1072:20:17, 7 May 2024 (UTC) 994:19:35, 7 May 2024 (UTC) 771:Cuboid (disambiguation) 319:07:14, 1 Jun 2005 (UTC) 98:WikiProject Mathematics 1123:revert to a gallery. — 821:10.1002/nme.1620170209 810:10.1002/nme.1620030407 585:doi:10.1007/BF03026511 28:This article is rated 304:talk page's article. 1047:"On Perfect Cuboids" 542:(rectangular) "box." 463:Talk:Cuboid/Comments 121:mathematics articles 941:hyperbolic geometry 555:p53, Def. 4) says: 328:A colleague added 1045:Ronald van Luijk. 943:, specifically in 779:Rectangular cuboid 689:rectangular cuboid 456:Assessment comment 211:User: Unregistered 176:From the article: 90:Mathematics portal 34:content assessment 967:, 256 vertices a 963:, 128 vertices a 815:Pissanetzky 1981 783:Cuboid (geometry) 528: 527: 423:comment added by 381:comment added by 280:justified. Ashby 194:comment added by 155: 154: 151: 150: 147: 146: 1194: 1078:gallery vs table 1054: 1053: 1051: 1042: 1036: 1035: 1027: 1021: 1020: 1008: 959:, 64 vertices a 955:, 32 vertices a 947:increasing axis 479:Press to view → 473: 465: 435: 393: 206: 123: 122: 119: 116: 113: 92: 87: 86: 76: 69: 68: 63: 55: 48: 31: 25: 24: 16: 1202: 1201: 1197: 1196: 1195: 1193: 1192: 1191: 1172: 1171: 1080: 1059: 1058: 1057: 1049: 1044: 1043: 1039: 1029: 1028: 1024: 1010: 1009: 1005: 932: 767:2019 PhD thesis 536: 461: 458: 418: 415: 376: 367: 326: 235: 233:The Word Itself 189: 160: 120: 117: 114: 111: 110: 88: 81: 61: 32:on Knowledge's 29: 12: 11: 5: 1200: 1198: 1190: 1189: 1184: 1174: 1173: 1170: 1169: 1168: 1167: 1166: 1165: 1164: 1163: 1139:David Eppstein 1125:David Eppstein 1106: 1087: 1086: 1079: 1076: 1075: 1074: 1064:David Eppstein 1056: 1055: 1037: 1022: 1002: 1001: 997: 978: 977: 931: 928: 927: 926: 925: 924: 923: 922: 921: 920: 919: 918: 917: 916: 915: 914: 913: 912: 911: 910: 900:David Eppstein 841:David Eppstein 837: 836: 835: 824: 813: 763: 749: 745: 741: 737: 734: 731: 727: 723: 719: 716: 713: 710: 697:David Eppstein 671: 668: 664: 661: 658: 654: 651: 647: 634:David Eppstein 603: 589:David Eppstein 535: 532: 526: 525: 503: 502: 481: 480: 477: 457: 454: 453: 452: 442:David Eppstein 414: 413:Am I correct.. 411: 410: 409: 366: 363: 352: 349: 348: 344: 341: 334: 333: 325: 322: 321: 320: 309: 306: 305: 287:Certainly the 285: 265: 261: 260: 249:parallelepiped 234: 231: 230: 229: 219:David Eppstein 174: 173: 159: 156: 153: 152: 149: 148: 145: 144: 133: 127: 126: 124: 107:the discussion 94: 93: 77: 65: 64: 56: 44: 43: 37: 26: 13: 10: 9: 6: 4: 3: 2: 1199: 1188: 1185: 1183: 1180: 1179: 1177: 1162: 1158: 1154: 1150: 1149: 1148: 1144: 1140: 1136: 1135: 1134: 1130: 1126: 1121: 1120: 1119: 1115: 1111: 1107: 1103: 1102: 1101: 1100: 1096: 1092: 1085: 1082: 1081: 1077: 1073: 1069: 1065: 1061: 1060: 1048: 1041: 1038: 1033: 1026: 1023: 1018: 1014: 1007: 1004: 1000: 996: 995: 991: 987: 984:to See Also. 983: 976: 974: 970: 966: 962: 958: 954: 950: 946: 942: 937: 936: 935: 929: 909: 905: 901: 897: 893: 889: 885: 881: 877: 873: 869: 865: 864: 863: 860: 857: 852: 851: 850: 846: 842: 838: 833: 829: 825: 822: 818: 814: 811: 807: 803: 802: 800: 799: 798: 795: 792: 788: 784: 780: 776: 773:at the title 772: 768: 764: 762: 758: 754: 750: 746: 742: 738: 735: 732: 728: 724: 720: 717: 714: 711: 708: 707: 706: 702: 698: 694: 690: 686: 685: 684: 680: 676: 672: 669: 665: 662: 659: 655: 652: 648: 645: 644: 643: 639: 635: 631: 630:WP:COMMONNAME 627: 622: 621: 620: 616: 612: 608: 604: 600: 599: 598: 594: 590: 586: 581: 580: 579: 578: 574: 570: 564: 561: 560: 557: 553: 552: 548: 545: 544: 540: 533: 531: 524: 521: 517: 516: 513: 508: 501: 498: 497: 496: 494: 489: 486: 482: 478: 475: 474: 471: 469: 464: 455: 451: 447: 443: 438: 437: 436: 434: 430: 426: 422: 412: 408: 404: 400: 396: 395: 394: 392: 388: 384: 380: 373: 370: 364: 362: 360: 356: 347:to be repaid. 345: 342: 339: 338: 337: 331: 330: 329: 323: 318: 314: 310: 307: 303: 299: 295: 290: 286: 283: 282: 281: 277: 276: 273: 269: 258: 257: 251: 250: 244: 243: 242: 241:that i added 240: 232: 228: 224: 220: 216: 215: 214: 212: 207: 205: 201: 197: 193: 185: 182: 181: 177: 172: 169: 165: 164: 163: 158:Square cuboid 157: 142: 138: 132: 129: 128: 125: 108: 104: 100: 99: 91: 85: 80: 78: 75: 71: 70: 66: 60: 57: 54: 50: 45: 41: 35: 27: 23: 18: 17: 1088: 1083: 1040: 1025: 1016: 1006: 998: 979: 933: 753:70.69.234.76 675:70.69.234.76 611:70.69.234.76 569:70.69.234.76 565: 562: 559: 556: 554: 549: 546: 543: 539: 537: 529: 506: 504: 499: 492: 490: 485:Geometry guy 459: 419:— Preceding 416: 383:130.88.75.48 377:— Preceding 374: 371: 368: 350: 335: 327: 324:Surface area 293: 288: 278: 262: 254:rectangular 253: 247:rectangular 246: 236: 213:18 Feb 2008 208: 196:186.45.84.40 190:— Preceding 186: 183: 179: 178: 175: 161: 137:Mid-priority 136: 96: 62:Mid‑priority 40:WikiProjects 520:RainerBlome 512:RainerBlome 425:77.96.59.93 365:Euler Brick 168:RainerBlome 112:Mathematics 103:mathematics 59:Mathematics 30:Start-class 1176:Categories 1153:Dedhert.Jr 999:References 930:extensions 888:1912.09554 880:2212.14721 872:1707.06563 826:Kohl 1996 787:Hexahedron 693:WP:NOTDICT 626:WP:NOTDICT 476:Comment(s) 302:lk to this 284:Good then. 1105:screen... 982:hypercube 856:jacobolus 791:jacobolus 744:apparent. 722:article). 650:"cuboid"? 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Index


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Mathematics
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Mathematics portal
WikiProject Mathematics
mathematics
the discussion
Mid
project's priority scale
RainerBlome
06:36, 23 July 2007 (UTC)
unsigned
186.45.84.40
talk
10:15, 2 October 2013 (UTC)
User: Unregistered
David Eppstein
talk
15:39, 2 October 2013 (UTC)
says
parallelepiped
prism
Jerzy
t
17:25, 27 May 2005 (UTC)
box

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