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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 2238 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
| 4 | 1, 3 | sseqtrd 3275 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ⊆ wss 3210 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-in 3216 df-ss 3223 |
| This theorem is referenced by: sseqtrrid 3288 fnfvima 5920 tfrlemiubacc 6560 tfr1onlemubacc 6576 tfrcllemubacc 6589 rdgivallem 6611 nnnninf 7416 nninfwlpoimlemg 7465 ccatass 11292 swrdval2 11339 dfphi2 12913 ctinf 13173 imasaddfnlemg 13519 imasaddvallemg 13520 subsubm 13688 subsubg 13906 subsubrng 14351 subsubrg 14382 lidlss 14616 toponss 14883 ssntr 14979 iscnp3 15060 cnprcl2k 15063 tgcn 15065 tgcnp 15066 ssidcn 15067 cncnp 15087 txcnp 15128 imasnopn 15156 hmeontr 15170 blssec 15295 blssopn 15342 xmettx 15367 metcnp 15369 plyaddlem1 15604 plymullem1 15605 plycoeid3 15614 nnsf 16775 nninfsellemsuc 16782 |
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