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| Mirrors > Home > ILE Home > Th. List > sseqtrrd | GIF version | ||
| Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.) |
| Ref | Expression |
|---|---|
| sseqtrrd.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
| sseqtrrd.2 | ⊢ (𝜑 → 𝐶 = 𝐵) |
| Ref | Expression |
|---|---|
| sseqtrrd | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseqtrrd.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
| 2 | sseqtrrd.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐵) | |
| 3 | 2 | eqcomd 2244 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
| 4 | 1, 3 | sseqtrd 3286 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-11 1559 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-in 3226 df-ss 3233 |
| This theorem is used by: sseqtrrid 3299 fnfvima 5956 tfrlemiubacc 6606 tfr1onlemubacc 6622 tfrcllemubacc 6635 rdgivallem 6657 isfsuppf 7298 nnnninf 7473 nninfwlpoimlemg 7522 ccatass 11398 swrdval2 11445 dfphi2 13027 ctinf 13379 imasaddfnlemg 13694 imasaddvallemg 13695 subsubm 13849 subsubg 14059 cntzmhm2 14174 subsubrng 14631 subsubrg 14662 lidlss 14922 mvrclfi 15238 toponss 15285 ssntr 15381 iscnp3 15462 cnprcl2k 15465 tgcn 15467 tgcnp 15468 ssidcn 15469 cncnp 15489 txcnp 15530 imasnopn 15558 hmeontr 15572 blssec 15697 blssopn 15744 xmettx 15769 metcnp 15771 plyaddlem1 16006 plymullem1 16007 plycoeid3 16016 nnsf 17287 nninfsellemsuc 17294 |
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