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| Mirrors > Home > ILE Home > Th. List > sseq1d | GIF version | ||
| Description: An equality deduction for the subclass relationship. (Contributed by NM, 14-Aug-1994.) |
| Ref | Expression |
|---|---|
| sseq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| sseq1d | ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sseq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | sseq1 3247 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1395 ⊆ wss 3197 |
| 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 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-11 1552 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-in 3203 df-ss 3210 |
| This theorem is referenced by: sseq12d 3255 eqsstrd 3260 snssgOLD 3804 ssiun2s 4009 treq 4188 onsucsssucexmid 4620 funimass1 5401 feq1 5459 sbcfg 5475 fvmptssdm 5724 fvimacnvi 5754 nnsucsssuc 6651 ereq1 6700 elpm2r 6826 fipwssg 7162 nnnninf 7309 ctssexmid 7333 rspssp 14479 iscnp 14894 iscnp4 14913 cnntr 14920 cnconst2 14928 cnptopresti 14933 cnptoprest 14934 txbas 14953 txcnp 14966 txdis 14972 txdis1cn 14973 blssps 15122 blss 15123 ssblex 15126 blin2 15127 metss2 15193 metrest 15201 metcnp3 15206 cnopnap 15306 limccl 15354 ellimc3apf 15355 ausgrumgrien 15989 ausgrusgrien 15990 |
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