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Mirrors > Home > ILE Home > Th. List > 4on | Unicode version |
Description: Ordinal 3 is an ordinal number. (Contributed by Mario Carneiro, 5-Jan-2016.) |
Ref | Expression |
---|---|
4on |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-4o 6398 | . 2 | |
2 | 3on 6406 | . . 3 | |
3 | 2 | onsuci 4500 | . 2 |
4 | 1, 3 | eqeltri 2243 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 2141 con0 4348 csuc 4350 c3o 6390 c4o 6391 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-sep 4107 ax-nul 4115 ax-pow 4160 ax-pr 4194 ax-un 4418 |
This theorem depends on definitions: df-bi 116 df-tru 1351 df-nf 1454 df-sb 1756 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ral 2453 df-rex 2454 df-v 2732 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-nul 3415 df-pw 3568 df-sn 3589 df-pr 3590 df-uni 3797 df-tr 4088 df-iord 4351 df-on 4353 df-suc 4356 df-1o 6395 df-2o 6396 df-3o 6397 df-4o 6398 |
This theorem is referenced by: (None) |
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