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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 7467 nninfwlpoimlemg 7516 ccatass 11391 swrdval2 11438 dfphi2 13020 ctinf 13372 imasaddfnlemg 13686 imasaddvallemg 13687 subsubm 13841 subsubg 14051 subsubrng 14573 subsubrg 14604 lidlss 14864 toponss 15179 ssntr 15275 iscnp3 15356 cnprcl2k 15359 tgcn 15361 tgcnp 15362 ssidcn 15363 cncnp 15383 txcnp 15424 imasnopn 15452 hmeontr 15466 blssec 15591 blssopn 15638 xmettx 15663 metcnp 15665 plyaddlem1 15900 plymullem1 15901 plycoeid3 15910 nnsf 17170 nninfsellemsuc 17177 |
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