| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 3260 | . 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 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: sseq12d 3268 eqsstrd 3273 snssgOLD 3829 ssiun2s 4034 treq 4213 onsucsssucexmid 4648 funimass1 5432 feq1 5490 sbcfg 5506 fvmptssdm 5761 fvimacnvi 5791 nnsucsssuc 6724 ereq1 6773 elpm2r 6899 fipwssg 7265 nnnninf 7416 ctssexmid 7440 rspssp 14629 iscnp 15051 iscnp4 15070 cnntr 15077 cnconst2 15085 cnptopresti 15090 cnptoprest 15091 txbas 15110 txcnp 15123 txdis 15129 txdis1cn 15130 blssps 15279 blss 15280 ssblex 15283 blin2 15284 metss2 15350 metrest 15358 metcnp3 15363 cnopnap 15463 limccl 15511 ellimc3apf 15512 ausgrumgrien 16152 ausgrusgrien 16153 eupth2lem3lem4fi 16455 |
| Copyright terms: Public domain | W3C validator |