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Mirrors > Home > ILE Home > Th. List > unisucg | Unicode version |
Description: A transitive class is equal to the union of its successor. Combines Theorem 4E of [Enderton] p. 72 and Exercise 6 of [Enderton] p. 73. (Contributed by Jim Kingdon, 18-Aug-2019.) |
Ref | Expression |
---|---|
unisucg |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-suc 4288 | . . . . . 6 | |
2 | 1 | unieqi 3741 | . . . . 5 |
3 | uniun 3750 | . . . . 5 | |
4 | 2, 3 | eqtri 2158 | . . . 4 |
5 | unisng 3748 | . . . . 5 | |
6 | 5 | uneq2d 3225 | . . . 4 |
7 | 4, 6 | syl5eq 2182 | . . 3 |
8 | 7 | eqeq1d 2146 | . 2 |
9 | df-tr 4022 | . . 3 | |
10 | ssequn1 3241 | . . 3 | |
11 | 9, 10 | bitri 183 | . 2 |
12 | 8, 11 | syl6rbbr 198 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wceq 1331 wcel 1480 cun 3064 wss 3066 csn 3522 cuni 3731 wtr 4021 csuc 4282 |
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-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-rex 2420 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-sn 3528 df-pr 3529 df-uni 3732 df-tr 4022 df-suc 4288 |
This theorem is referenced by: onsucuni2 4474 nlimsucg 4476 ctmlemr 6986 nnsf 13188 peano4nninf 13189 |
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