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B-theory of time

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266:. Hales and Johnson explain endurantism as follows: "something is an enduring object only if it is wholly present at each time in which it exists. An object is wholly present at a time if all of its parts co-exist at that time." Under endurantism, all objects must exist as wholes at each point in time, but an object such as a rotting fruit will have the property of being not rotten one day and being rotten on another. On eternalism, and hence the B-theory, it seems that one is committed to two conflicting states for the same object. The spacetime (Minkowskian) interpretation of relativity adds an additional problem for endurantism under B-theory. On the spacetime interpretation, an object may appear as a whole at its rest frame, but on an 234:-reflexive phrase such as "simultaneous with this utterance", yet Smith states that even such an argument fails to eliminate tense. One can think the statement "I am not uttering anything now", and such a statement would be true. The statement "I am not uttering anything simultaneous with this utterance" is self-contradictory, and cannot be true even when one thinks the statement. Finally, while tensed statements can express token-independent truth values, no token-reflexive statement can do so (by definition of the term "token-reflexive"). Smith claims that proponents of the B-theory argue that the inability to translate tensed sentences into tenseless sentences does not prove A-theory. 242:
is in the future. Prior asks the reader to imagine having a headache, and after the headache subsides, saying "thank goodness that's over." Prior argues that the B-theory cannot make sense of this sentence. It seems bizarre to be thankful that a headache is earlier than one's utterance, anymore than being thankful that the headache is later than one's utterance. Indeed, most people who say "thank goodness that's over" are not even thinking of their own utterance. Therefore, when people say "thank goodness that's over," they are thankful for an A-fact, and not a B-fact. Yet, A-facts are only possible on the A-theory of time. (See also:
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leads to difficulties. For example, the rotating discs argument asks the reader to imagine a world containing nothing more than a homogeneous spinning disk. Under endurantism, the same disc endures despite its rotations. The perdurantist supposedly has a difficult time explaining what it means for such a disc to have a determinate state of rotation. Temporal parts also seem to act unlike physical parts. A piece of chalk can be broken into two physical halves, but it seems nonsensical to talk about breaking it into two temporal halves. American epistemologist
113:. Parmenides thought that reality is timeless and unchanging. Heraclitus, in contrast, believed that the world is a process of ceaseless change or flux. Reality for Heraclitus is dynamic and ephemeral. Indeed, the world is so fleeting, according to Heraclitus, that it is impossible to step twice into the same river. The metaphysical issues that continue to divide A-theorists and B-theorists concern the reality of the past, the reality of the future, and the ontological status of the present. 637: 2335: 2345: 278:
argued that someone who hears the bird call "Bob White" knows "that his experience of hearing 'Bob' and his experience of hearing 'White' were not also had by two other things, each distinct from himself and from each other. The endurantist can explain the experience as "There exists an x such that x
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The difference between A-theorists and B-theorists is often described as a dispute about temporal passage or 'becoming' and 'progressing'. B-theorists argue that this notion is purely psychological. Many A-theorists argue that in rejecting temporal 'becoming', B-theorists reject time's most vital and
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has also drawn a distinction between what he calls A-facts and B-facts. The latter are facts about tenseless relations, such as the fact that the year 2025 is 25 years later than the year 2000. The former are tensed facts, such as that the Jurassic age is in the past, or that the end of the universe
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or auxiliary adverbial modifiers. Alternatively, events may be described as earlier than, simultaneous with, or later than others. Philosophers are divided as to whether the tensed or tenseless mode of expressing temporal fact is fundamental. Some philosophers have criticised hybrid theories, where
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wish to eliminate all talk of past, present and future in favour of a tenseless ordering of events, believing the past, present, and future to be equally real, opposing the idea that they are irreducible foundations of temporality. B-theorists also argue that the past, present, and future feature
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asks the reader to consider Descartes as a four-dimensional object that extends from 1596 to 1650. If Descartes had lived a much shorter life, he would have had a radically different set of temporal parts. This diminished Descartes, he argues, could not have been the same person on perdurantism,
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Opponents will then charge perdurantism with numerous difficulties of its own. First, it is controversial whether perdurantism can be formulated coherently. An object is defined as a collection of spatiotemporal parts, defined as pieces of a perduring object. If objects have temporal parts, this
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Earlier B-theorists argued that one could paraphrase tensed sentences (such as "the sun is now shining", uttered on September 28) into tenseless sentences (such as "on September 28, the sun shines") without loss of meaning. Later B-theorists argued that tenseless sentences could give the truth
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argues that "now" cannot be reduced to descriptions of dates and times, because all date and time descriptions, and therefore truth conditionals, are relative to certain events. Tensed sentences, on the other hand, do not have such truth conditionals. The B-theorist could argue that "now" is
85:" (1908), in which events are ordered via a tensed A-series or a tenseless B-series. It is popularly assumed that the A theory represents time like an A-series, while the B theory represents time like a B-series. The terms A and B theory are sometimes used as synonyms to the terms 96:
Events (or "times"), McTaggart observed, may be characterized in two distinct but related ways. On the one hand they can be characterized as past, present or future, normally indicated in natural languages such as English by the verbal inflection of
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very differently in deliberation and reflection. For example, we remember the past and anticipate the future, but not vice versa. B-theorists maintain that the fact that we know much less about the future simply reflects an
42:, that the past, present, and future are equally real, and that time is tenseless: temporal becoming is not an objective feature of reality. Therefore, there is nothing privileged about the present, ontologically speaking. 126:, the thesis that contrary to what appears to be the case, all times really exist in parity. A-theory (and especially presentism) denies that all times exist in parity, while B-theory insists all times exist in parity. 122:
distinctive characteristic. It is common (though not universal) to identify A-theorists' views with belief in temporal passage. Another way to characterise the distinction revolves around what is known as the
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one holds a tenseless view of time but asserts that the present has special properties, as falling foul of McTaggart's paradox. For a thorough discussion of McTaggart's paradox, see R. D. Ingthorsson (2016).
270:, it will have proper parts at different positions, and therefore different parts at different times. Hence it will not exist as a whole at any time, contradicting endurantism. 207:, that is, to believe that objects are extended in time as well as in space and therefore have temporal as well as spatial parts. This is sometimes called a time-slice 998: 2603: 262:. According to the former, an object is wholly present at every moment of its existence. According to the latter, objects are extended in time and therefore have 2569: 2381: 93:, but arguably presentism does not represent time being like an A-series since it denies that there is a future and past in which events can be located. 188:(and hence a B-theory of time), where the present for different observers is a time slice of the four-dimensional universe. This is demonstrated in the 150:
The B-theory of time has received support from physicists. This is likely due to its compatibility with physics and the fact that many theories such as
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shows that there is no unique present, and that each point in the universe can have a different set of events that are in its present moment.
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Opponents also charge the B-theory with being unable to explain persistence of objects. The two leading explanations for this phenomenon are
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The debate between A-theorists and B-theorists is a continuation of a metaphysical dispute reaching back to the ancient Greek philosophers
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difference between the future and the past: the future is no less real than the past; we just know less about it.
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hears 'Bob' and then x hears 'White'" but the perdurantist cannot give such an account.
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Williams, Clifford. "'Now', Extensional Interchangeability, and the Passage of Time".
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Many of special relativity's now-proven counterintuitive predictions, such as
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Teller, Paul (2002). "The Rotating Disc Argument and Humean Supervenience".
155: 1381: 973:(1. publ., repr. ed.). New York: Cambridge University Press. pp.  184:, are a result of this. Relativity of simultaneity is often taken to imply 1375: 1349: 2541: 2505: 2434: 1846: 1607: 1599: 1457: 1447: 208: 602: 353: 2185: 2175: 2097: 2088: 2073: 1975: 1960: 1805: 1728: 1437: 1220: 851: 745: 830:
Beer, Michelle (1988). "Temporal Indexicals and the Passage of Time".
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It is therefore common (though not universal) for B-theorists to be
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Callender, Craig (September 1, 2000). "Shedding Light on Time".
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Philosophical theory regarding temporal ordering of events
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since their temporal extents and parts are so different.
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The Tenseless Theory of Time: A Critical Examination
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The Tenseless Theory of Time: A Critical Examination
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The B-theory is derived from a distinction drawn by
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J. C. Smart 118: 115: 66: 63: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2631: 2620: 2617: 2615: 2612: 2610: 2607: 2605: 2602: 2600: 2597: 2596: 2594: 2579: 2578: 2574: 2572: 2571: 2567: 2564: 2560: 2558: 2555: 2553: 2550: 2548: 2545: 2543: 2540: 2539: 2537: 2533: 2527: 2524: 2522: 2519: 2517: 2514: 2512: 2509: 2507: 2504: 2502: 2499: 2497: 2494: 2492: 2489: 2487: 2484: 2482: 2479: 2478: 2476: 2472: 2466: 2463: 2461: 2458: 2456: 2453: 2451: 2448: 2446: 2443: 2441: 2438: 2436: 2433: 2431: 2428: 2426: 2423: 2421: 2418: 2416: 2413: 2411: 2408: 2406: 2403: 2402: 2400: 2396: 2392: 2385: 2380: 2378: 2373: 2371: 2366: 2365: 2362: 2350: 2342: 2340: 2332: 2331: 2328: 2322: 2319: 2317: 2314: 2312: 2309: 2307: 2306: 2302: 2300: 2297: 2295: 2292: 2290: 2287: 2285: 2282: 2280: 2277: 2276: 2274: 2270: 2260: 2257: 2255: 2252: 2250: 2247: 2243: 2240: 2239: 2238: 2237:Chronobiology 2235: 2233: 2230: 2229: 2227: 2223: 2217: 2214: 2212: 2209: 2207: 2204: 2202: 2199: 2197: 2194: 2192: 2189: 2187: 2184: 2182: 2179: 2177: 2174: 2172: 2171:Arrow of time 2169: 2167: 2164: 2163: 2161: 2159: 2155: 2149: 2146: 2144: 2143:Geochronology 2141: 2137: 2134: 2132: 2129: 2127: 2124: 2122: 2119: 2117: 2114: 2112: 2109: 2108: 2107: 2104: 2103: 2101: 2099: 2095: 2092: 2090: 2085: 2079: 2075: 2071: 2068: 2066: 2063: 2061: 2058: 2056: 2053: 2049: 2046: 2044: 2041: 2040: 2039: 2036: 2034: 2031: 2029: 2026: 2024: 2021: 2020: 2018: 2016: 2011: 2007: 1999: 1996: 1995: 1994: 1993:Wheel of time 1991: 1987: 1984: 1983: 1982: 1979: 1977: 1974: 1972: 1969: 1967: 1964: 1962: 1959: 1957: 1954: 1953: 1951: 1946: 1943: 1941: 1938: 1937: 1934: 1928: 1927: 1923: 1921: 1918: 1916: 1913: 1911: 1908: 1906: 1903: 1901: 1898: 1896: 1893: 1891: 1888: 1886: 1883: 1881: 1878: 1876: 1873: 1871: 1868: 1866: 1863: 1862: 1860: 1858: 1854: 1848: 1845: 1843: 1840: 1838: 1837:Periodization 1835: 1833: 1830: 1828: 1825: 1823: 1820: 1818: 1815: 1814: 1812: 1807: 1804: 1802: 1799: 1798: 1795: 1783: 1782: 1778: 1777: 1776: 1775: 1771: 1769: 1766: 1764: 1763:Digital clock 1761: 1759: 1756: 1752: 1749: 1745: 1742: 1740: 1737: 1736: 1735: 1732: 1730: 1727: 1725: 1722: 1720: 1717: 1713: 1710: 1709: 1708: 1705: 1701: 1698: 1697: 1696: 1693: 1692: 1691: 1688: 1687: 1685: 1683: 1679: 1673: 1672: 1668: 1666: 1663: 1661: 1658: 1656: 1653: 1651: 1648: 1646: 1643: 1641: 1638: 1636: 1633: 1631: 1628: 1624: 1621: 1619: 1616: 1614: 1611: 1610: 1609: 1606: 1605: 1603: 1601: 1597: 1591: 1588: 1586: 1583: 1581: 1578: 1576: 1573: 1571: 1568: 1566: 1563: 1561: 1558: 1556: 1553: 1551: 1548: 1546: 1543: 1541: 1540:Relative hour 1538: 1536: 1535:24-hour clock 1533: 1531: 1530:12-hour clock 1528: 1526: 1523: 1521: 1518: 1517: 1515: 1513: 1507: 1501: 1498: 1496: 1493: 1491: 1488: 1486: 1483: 1481: 1478: 1477: 1475: 1473: 1469: 1466: 1464: 1459: 1455: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1431: 1430: 1428: 1424: 1420: 1413: 1408: 1406: 1401: 1399: 1394: 1393: 1390: 1383: 1380: 1377: 1373: 1372: 1368: 1362: 1358: 1355: 1351: 1347: 1343: 1339: 1335: 1331: 1328: 1324: 1321: 1318: 1314: 1311: 1308: 1304: 1301: 1297: 1293: 1290:(4): 457ā€“73. 1289: 1285: 1281: 1277: 1273: 1270: 1267: 1264: 1261: 1257: 1254: 1251: 1247: 1244: 1241: 1237: 1234: 1230: 1226: 1222: 1218: 1214: 1210: 1205: 1204: 1199: 1191: 1184: 1181: 1176: 1170: 1166: 1159: 1156: 1151: 1144: 1141: 1136: 1132: 1128: 1124: 1117: 1114: 1109: 1105: 1098: 1095: 1090: 1086: 1079: 1076: 1071: 1065: 1061: 1057: 1056: 1048: 1045: 1040: 1028: 1020: 1019: 1011: 1009: 1005: 1000: 994: 986: 980: 976: 971: 970: 961: 958: 953: 947: 943: 936: 933: 928: 922: 918: 911: 908: 903: 897: 893: 886: 883: 878: 872: 868: 861: 858: 853: 849: 845: 841: 837: 833: 826: 823: 818: 812: 808: 801: 798: 793: 789: 782: 779: 774: 770: 763: 760: 755: 751: 747: 743: 739: 735: 728: 725: 721: 720: 715: 710: 707: 704: 698: 695: 692: 686: 683: 678: 672: 668: 663: 662: 653: 650: 639: 633: 630: 618: 612: 609: 604: 600: 596: 592: 585: 582: 577: 570: 567: 562: 558: 551: 548: 544: 540: 534: 531: 519: 515: 508: 505: 493: 489: 482: 479: 474: 468: 464: 457: 454: 449: 443: 439: 432: 430: 426: 421: 417: 413: 409: 406:: S587ā€“S599. 405: 401: 394: 391: 378: 374: 368: 366: 364: 360: 355: 351: 347: 343: 336: 333: 330: 324: 321: 316: 310: 306: 299: 297: 293: 287: 285: 282: 277: 271: 269: 265: 261: 257: 249: 247: 245: 244:Further facts 240: 235: 233: 228: 227:Quentin Smith 219: 214: 212: 210: 206: 201: 199: 195: 194:Roger Penrose 191: 187: 183: 182:time dilation 179: 174: 172: 168: 163: 161: 157: 153: 145: 143: 141: 136: 132: 127: 125: 116: 114: 112: 108: 103: 100: 94: 92: 88: 84: 80: 76: 72: 64: 62: 60: 56: 52: 48: 43: 41: 40:consciousness 37: 33: 19: 2575: 2568: 2521:Perdurantism 2485: 2311:Time capsule 2305:Tempus fugit 2303: 2225:Other fields 1924: 1905:Perdurantism 1869: 1827:Calendar era 1779: 1772: 1758:Cuckoo clock 1695:astronomical 1669: 1495:Unit of time 1426:Key concepts 1382:Arthur Prior 1360: 1341: 1337: 1326: 1317:Real Time II 1316: 1313:Mellor, D.H. 1306: 1287: 1283: 1268: 1260:Other Worlds 1259: 1256:Davies, Paul 1249: 1239: 1212: 1208: 1189: 1183: 1164: 1158: 1149: 1143: 1126: 1122: 1116: 1107: 1103: 1097: 1088: 1084: 1078: 1054: 1047: 1017: 968: 960: 941: 935: 916: 910: 891: 885: 866: 860: 835: 831: 825: 806: 800: 791: 787: 781: 772: 768: 762: 737: 733: 727: 717: 709: 697: 685: 661:Real time II 660: 652: 641:. Retrieved 632: 621:. Retrieved 611: 594: 590: 584: 575: 569: 560: 556: 550: 533: 521:. Retrieved 517: 514:"Heraclitus" 507: 495:. Retrieved 491: 488:"Parmenides" 481: 462: 456: 437: 403: 399: 393: 381:. Retrieved 345: 341: 335: 323: 304: 272: 260:perdurantism 253: 239:Arthur Prior 236: 223: 202: 175: 164: 149: 131:D. H. Mellor 128: 123: 120: 104: 95: 77:philosopher 68: 44: 31: 29: 2547:Metaphysics 2491:Endurantism 2465:Temporality 2321:Time travel 2299:System time 2206:Time domain 2191:Proper time 2015:use of time 1986:Father Time 1966:Immortality 1956:Ages of Man 1885:Endurantism 1842:Regnal year 1822:Big History 1751:water-based 1650:Solar Hijri 1560:Hexadecimal 1510:Measurement 1472:Chronometry 1458:Measurement 1323:Prior, A.N. 1246:Craig, W.L. 1236:Craig, W.L. 1110:(213): 535. 1091:(213): 532. 714:Penrose, R. 523:29 December 497:29 December 383:28 December 256:endurantism 2593:Categories 2526:Presentism 2496:Eternalism 2445:Eviternity 2023:Chronemics 1998:Kalachakra 1910:Presentism 1895:Eternalism 1801:Chronology 1739:mechanical 1690:Main types 1608:Main types 1334:Putnam, H. 1200:References 1192:: 252ā€“254. 1174:0814753752 1069:0631224262 951:0195082273 926:0195082273 901:0195082273 876:0195082273 676:0415097819 643:2014-03-03 623:2014-03-03 578:(68): 458. 543:VI, 58, 23 314:0792366352 215:Opposition 186:eternalism 111:Parmenides 107:Heraclitus 91:eternalism 87:presentism 69:The terms 59:eternalism 2557:Teleology 2279:Leap year 2196:Spacetime 2070:Yesterday 1971:Dreamtime 1945:Mythology 1832:Deep time 1744:stopwatch 1719:hourglass 1700:astrarium 1630:Gregorian 1623:Lunisolar 1600:Calendars 1590:Time zone 1463:standards 1229:170267880 1037:ignored ( 1027:cite book 993:cite book 754:170267880 563:(3): 249. 420:120906143 156:ADD model 75:Cambridge 2609:Ontology 2542:Etiology 2511:Finitism 2506:Fatalism 2435:Eternity 2425:Duration 2339:Category 2087:Time in 2078:Tomorrow 1940:Religion 1880:Duration 1847:Timeline 1781:Timeline 1580:Sidereal 1448:Eternity 1278:(1908). 1123:Analysis 716:(1989). 603:20009790 354:20009201 209:ontology 49:between 2349:Commons 2272:Related 2186:Instant 2176:Chronon 2158:Physics 2098:Geology 2089:science 1961:Destiny 1806:History 1774:History 1729:sundial 1712:quantum 1655:Chinese 1645:Islamic 1555:Decimal 1550:Chinese 1512:systems 1438:Present 1359:(1960) 1325:(2003) 1315:(1998) 1305:(1927) 1258:(1980) 1248:(2000) 1238:(2001) 852:2219921 192:and in 2420:Action 2289:Moment 2284:Memory 2136:period 1724:marine 1707:atomic 1682:Clocks 1640:Hebrew 1635:Julian 1570:Metric 1443:Future 1227:  1171:  1066:  981:  977:ā€“170. 948:  923:  898:  873:  850:  813:  775:: 405. 752:  673:  601:  539:Seneca 469:  444:  418:  377:"Time" 352:  311:  169:, the 158:, and 154:, the 99:tenses 2440:Event 2294:Space 2126:epoch 2116:chron 2074:Today 2043:tempo 2038:Music 1900:Event 1734:watch 1618:Lunar 1613:Solar 1585:Solar 1575:Roman 1565:Hindu 1225:S2CID 1152:: 80. 848:JSTOR 750:S2CID 599:JSTOR 416:S2CID 350:JSTOR 288:Notes 232:token 2614:Time 2405:Time 2013:and 1976:Kāla 1671:List 1665:Maya 1461:and 1433:Past 1419:Time 1376:Time 1284:Mind 1190:NoĆ»s 1169:ISBN 1064:ISBN 1039:help 999:link 979:ISBN 946:ISBN 921:ISBN 896:ISBN 871:ISBN 811:ISBN 671:ISBN 576:Mind 525:2014 499:2014 467:ISBN 442:ISBN 385:2014 309:ISBN 258:and 180:and 133:and 109:and 89:and 30:The 2131:era 2121:eon 2111:age 1490:TAI 1480:UTC 1346:doi 1292:doi 1217:doi 1131:doi 1060:202 975:169 840:doi 742:doi 408:doi 246:.) 165:In 2595:: 2076:ā€“ 2072:ā€“ 1485:UT 1342:56 1340:. 1288:17 1286:. 1282:. 1223:. 1213:33 1211:. 1127:62 1125:. 1108:53 1106:. 1089:53 1087:. 1062:. 1031:: 1029:}} 1025:{{ 1007:^ 995:}} 991:{{ 846:. 836:38 834:. 790:. 771:. 748:. 738:33 736:. 669:. 667:21 595:31 593:. 561:46 559:. 516:. 490:. 428:^ 414:. 404:67 402:. 375:. 362:^ 344:. 295:^ 211:. 200:. 61:. 2565:" 2561:" 2383:e 2376:t 2369:v 1411:e 1404:t 1397:v 1352:. 1348:: 1298:. 1294:: 1231:. 1219:: 1177:. 1137:. 1133:: 1072:. 1041:) 1001:) 987:. 954:. 929:. 904:. 879:. 854:. 842:: 819:. 794:. 792:8 773:5 756:. 744:: 679:. 646:. 626:. 605:. 545:. 527:. 501:. 475:. 450:. 422:. 410:: 387:. 356:. 346:3 317:. 20:)

Index

Russellian change
philosophy of time
consciousness
J. M. E. McTaggart
A series and B series
theoretical physics
eternalism
A-theory and B-theory
Cambridge
J. M. E. McTaggart
The Unreality of Time
presentism
eternalism
tenses
Heraclitus
Parmenides
D. H. Mellor
J. J. C. Smart
epistemological
special relativity
ADD model
brane cosmology
special relativity
relativity of simultaneity
length contraction
time dilation
eternalism
Rietdijkā€“Putnam argument
Roger Penrose
Andromeda paradox

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