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Talk:Representable functor

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My feeling was only that the natural transformation should be specified as given, because the functors have to be naturally isomorphic in that way. Isn't that right? If not, then your edits are how the page should be. If so, maybe something like '... naturally isomorphic to
163:; which is why I rewrote it that way. I think the way it is written now obscures this fact, and makes the notion seem more complicated that it really is. The fact that every functor can be represented by a pair ( 133: 349: 127: 103: 344: 321: 94: 58: 33: 325: 39: 301:
both have the same idea about how this article should go. I'm happy to let you make the changes above.
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I think it is much clearer to say that a functor is representable if it is naturally isomorphic to Hom(
80: 317: 289:. I think I finally understand that lemma. Perhaps something like that should go in the article too. 314:"represented by (FX, ηX(•)) where X = {•} is a singleton set" is unnecessarily confusing notation. 21: 102:
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Every natural isomorphism will necessarily be of the stated form. To see this let Φ : Hom(
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Ha. You are right of course. The argument I gave above is just one version of
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If it was like that already, I apologize. I can't remember. --
15: 98:, a collaborative effort to improve the coverage of 297:Yes, I guess they are pretty intertwined. I think 132:This article has not yet received a rating on the 255:around the commutative square induced by Hom( 8: 47: 184:. This natural isomorphism should be...' 203:be any natural isomorphism. Define φ ∈ 49: 19: 350:Unknown-priority mathematics articles 7: 167:,φ) is important, but secondary. -- 92:This article is within the scope of 38:It is of interest to the following 277:OK. Reminds me of Yoneda's lemma. 14: 112:Knowledge:WikiProject Mathematics 115:Template:WikiProject Mathematics 79: 69: 51: 20: 1: 330:15:19, 28 November 2008 (UTC) 106:and see a list of open tasks. 345:B-Class mathematics articles 366: 293:00:21, 2004 Jul 30 (UTC) 273:23:04, 2004 Jul 28 (UTC) 223:). Then for any morphism 171:14:59, 2004 Jul 28 (UTC) 131: 64: 46: 305:10:50, 30 Jul 2004 (UTC) 281:08:00, 29 Jul 2004 (UTC) 191:21:17, 28 Jul 2004 (UTC) 134:project's priority scale 95:WikiProject Mathematics 28:This article is rated 249:)(φ) by following id 118:mathematics articles 235:one can show that Φ 310:Confusing Notation 87:Mathematics portal 34:content assessment 320:comment added by 148: 147: 144: 143: 140: 139: 357: 332: 120: 119: 116: 113: 110: 89: 84: 83: 73: 66: 65: 55: 48: 31: 25: 24: 16: 365: 364: 360: 359: 358: 356: 355: 354: 335: 334: 315: 312: 268: 254: 240: 222: 216: 153: 117: 114: 111: 108: 107: 85: 78: 32:on Knowledge's 29: 12: 11: 5: 363: 361: 353: 352: 347: 337: 336: 311: 308: 307: 306: 287:Yoneda's lemma 283: 282: 264: 250: 236: 218: 212: 193: 192: 185: 152: 149: 146: 145: 142: 141: 138: 137: 130: 124: 123: 121: 104:the discussion 91: 90: 74: 62: 61: 56: 44: 43: 37: 26: 13: 10: 9: 6: 4: 3: 2: 362: 351: 348: 346: 343: 342: 340: 333: 331: 327: 323: 322:131.111.28.92 319: 309: 304: 300: 296: 295: 294: 292: 288: 280: 276: 275: 274: 272: 267: 262: 258: 253: 248: 244: 239: 234: 230: 226: 221: 215: 210: 206: 202: 198: 190: 186: 183: 180:,-) for some 179: 174: 173: 172: 170: 166: 162: 159:,-) for some 158: 150: 135: 129: 126: 125: 122: 105: 101: 97: 96: 88: 82: 77: 75: 72: 68: 67: 63: 60: 57: 54: 50: 45: 41: 35: 27: 23: 18: 17: 313: 298: 284: 265: 260: 256: 251: 246: 242: 237: 232: 228: 224: 219: 213: 208: 204: 200: 196: 194: 181: 177: 164: 160: 156: 154: 93: 40:WikiProjects 316:—Preceding 109:Mathematics 100:mathematics 59:Mathematics 339:Categories 211:) by φ = Φ 151:Definition 318:unsigned 291:Fropuff 271:Fropuff 263:) and Φ 169:Fropuff 30:B-class 199:,-) → 36:scale. 303:mat_x 279:mat_x 269:. -- 245:) = ( 189:mat_x 326:talk 176:Hom( 217:(id 128:??? 341:: 328:) 299:we 247:Fu 231:→ 227:: 324:( 266:A 261:u 259:, 257:A 252:A 243:u 241:( 238:X 233:X 229:A 225:u 220:A 214:A 209:A 207:( 205:F 201:F 197:A 182:A 178:A 165:A 161:A 157:A 136:. 42::

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Fropuff
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131.111.28.92
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15:19, 28 November 2008 (UTC)
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