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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 2237 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
| 4 | 1, 3 | sseqtrd 3266 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ⊆ wss 3201 |
| 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 2213 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-in 3207 df-ss 3214 |
| This theorem is referenced by: sseqtrrid 3279 fnfvima 5899 tfrlemiubacc 6539 tfr1onlemubacc 6555 tfrcllemubacc 6568 rdgivallem 6590 nnnninf 7368 nninfwlpoimlemg 7417 ccatass 11232 swrdval2 11279 dfphi2 12853 ctinf 13112 imasaddfnlemg 13458 imasaddvallemg 13459 subsubm 13627 subsubg 13845 subsubrng 14290 subsubrg 14321 lidlss 14552 toponss 14817 ssntr 14913 iscnp3 14994 cnprcl2k 14997 tgcn 14999 tgcnp 15000 ssidcn 15001 cncnp 15021 txcnp 15062 imasnopn 15090 hmeontr 15104 blssec 15229 blssopn 15276 xmettx 15301 metcnp 15303 plyaddlem1 15538 plymullem1 15539 plycoeid3 15548 nnsf 16711 nninfsellemsuc 16718 |
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