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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 5953 tfrlemiubacc 6601 tfr1onlemubacc 6617 tfrcllemubacc 6630 rdgivallem 6652 nnnninf 7466 nninfwlpoimlemg 7515 ccatass 11378 swrdval2 11425 dfphi2 13000 ctinf 13323 imasaddfnlemg 13637 imasaddvallemg 13638 subsubm 13792 subsubg 14002 subsubrng 14524 subsubrg 14555 lidlss 14815 toponss 15129 ssntr 15225 iscnp3 15306 cnprcl2k 15309 tgcn 15311 tgcnp 15312 ssidcn 15313 cncnp 15333 txcnp 15374 imasnopn 15402 hmeontr 15416 blssec 15541 blssopn 15588 xmettx 15613 metcnp 15615 plyaddlem1 15850 plymullem1 15851 plycoeid3 15860 nnsf 17060 nninfsellemsuc 17067 |
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