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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 2240 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
| 4 | 1, 3 | sseqtrd 3280 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ⊆ wss 3214 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-11 1555 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-in 3220 df-ss 3227 |
| This theorem is referenced by: sseqtrrid 3293 fnfvima 5926 tfrlemiubacc 6574 tfr1onlemubacc 6590 tfrcllemubacc 6603 rdgivallem 6625 nnnninf 7430 nninfwlpoimlemg 7479 ccatass 11321 swrdval2 11368 dfphi2 12942 ctinf 13265 imasaddfnlemg 13611 imasaddvallemg 13612 subsubm 13780 subsubg 13998 subsubrng 14445 subsubrg 14476 lidlss 14736 toponss 15003 ssntr 15099 iscnp3 15180 cnprcl2k 15183 tgcn 15185 tgcnp 15186 ssidcn 15187 cncnp 15207 txcnp 15248 imasnopn 15276 hmeontr 15290 blssec 15415 blssopn 15462 xmettx 15487 metcnp 15489 plyaddlem1 15724 plymullem1 15725 plycoeid3 15734 nnsf 16895 nninfsellemsuc 16902 |
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