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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 2235 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
| 4 | 1, 3 | sseqtrd 3263 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ⊆ wss 3198 |
| 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 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-11 1552 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-in 3204 df-ss 3211 |
| This theorem is referenced by: sseqtrrid 3276 fnfvima 5884 tfrlemiubacc 6491 tfr1onlemubacc 6507 tfrcllemubacc 6520 rdgivallem 6542 nnnninf 7319 nninfwlpoimlemg 7368 ccatass 11178 swrdval2 11225 dfphi2 12785 ctinf 13044 imasaddfnlemg 13390 imasaddvallemg 13391 subsubm 13559 subsubg 13777 subsubrng 14221 subsubrg 14252 lidlss 14483 toponss 14743 ssntr 14839 iscnp3 14920 cnprcl2k 14923 tgcn 14925 tgcnp 14926 ssidcn 14927 cncnp 14947 txcnp 14988 imasnopn 15016 hmeontr 15030 blssec 15155 blssopn 15202 xmettx 15227 metcnp 15229 plyaddlem1 15464 plymullem1 15465 plycoeid3 15474 nnsf 16557 nninfsellemsuc 16564 |
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