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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 |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ⊆ wss 3220 |
| This proof depends on 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 proof 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 used by: sseqtrrid 3299 fnfvima 5956 tfrlemiubacc 6605 tfr1onlemubacc 6621 tfrcllemubacc 6634 rdgivallem 6656 nnnninf 7473 nninfwlpoimlemg 7522 ccatass 11399 swrdval2 11446 dfphi2 13028 ctinf 13380 imasaddfnlemg 13695 imasaddvallemg 13696 subsubm 13850 subsubg 14060 cntzmhm2 14175 subsubrng 14632 subsubrg 14663 lidlss 14923 toponss 15264 ssntr 15360 iscnp3 15441 cnprcl2k 15444 tgcn 15446 tgcnp 15447 ssidcn 15448 cncnp 15468 txcnp 15509 imasnopn 15537 hmeontr 15551 blssec 15676 blssopn 15723 xmettx 15748 metcnp 15750 plyaddlem1 15985 plymullem1 15986 plycoeid3 15995 nnsf 17266 nninfsellemsuc 17273 |
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