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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 3262 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ⊆ wss 3197 |
| 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 3203 df-ss 3210 |
| This theorem is referenced by: sseqtrrid 3275 fnfvima 5881 tfrlemiubacc 6487 tfr1onlemubacc 6503 tfrcllemubacc 6516 rdgivallem 6538 nnnninf 7309 nninfwlpoimlemg 7358 ccatass 11161 swrdval2 11204 dfphi2 12763 ctinf 13022 imasaddfnlemg 13368 imasaddvallemg 13369 subsubm 13537 subsubg 13755 subsubrng 14199 subsubrg 14230 lidlss 14461 toponss 14721 ssntr 14817 iscnp3 14898 cnprcl2k 14901 tgcn 14903 tgcnp 14904 ssidcn 14905 cncnp 14925 txcnp 14966 imasnopn 14994 hmeontr 15008 blssec 15133 blssopn 15180 xmettx 15205 metcnp 15207 plyaddlem1 15442 plymullem1 15443 plycoeid3 15452 nnsf 16485 nninfsellemsuc 16492 |
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