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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 |
| Syntax hints: → wi 4 = wceq 1402 ⊆ wss 3220 |
| 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 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 theorem 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 referenced by: sseqtrrid 3299 fnfvima 5947 tfrlemiubacc 6595 tfr1onlemubacc 6611 tfrcllemubacc 6624 rdgivallem 6646 nnnninf 7460 nninfwlpoimlemg 7509 ccatass 11359 swrdval2 11406 dfphi2 12981 ctinf 13304 imasaddfnlemg 13618 imasaddvallemg 13619 subsubm 13773 subsubg 13983 subsubrng 14505 subsubrg 14536 lidlss 14796 toponss 15110 ssntr 15206 iscnp3 15287 cnprcl2k 15290 tgcn 15292 tgcnp 15293 ssidcn 15294 cncnp 15314 txcnp 15355 imasnopn 15383 hmeontr 15397 blssec 15522 blssopn 15569 xmettx 15594 metcnp 15596 plyaddlem1 15831 plymullem1 15832 plycoeid3 15841 nnsf 17022 nninfsellemsuc 17029 |
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