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| Mirrors > Home > ILE Home > Th. List > eqimss | GIF version | ||
| Description: Equality implies the subclass relation. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 21-Jun-2011.) |
| Ref | Expression |
|---|---|
| eqimss | ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqss 3263 | . 2 ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) | |
| 2 | 1 | simplbi 274 | 1 ⊢ (𝐴 = 𝐵 → 𝐴 ⊆ 𝐵) |
| 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: eqimss2 3303 uneqin 3482 ssprsseq 3877 sssnr 3878 sssnm 3879 ssprr 3881 sstpr 3882 snsspw 3889 pwpwssunieq 4101 elpwuni 4102 disjeq2 4110 disjeq1 4113 pwne 4299 pwssunim 4431 poeq2 4447 seeq1 4486 seeq2 4487 trsucss 4570 onsucelsucr 4657 xp11m 5229 funeq 5400 fnresdm 5495 fssxp 5558 ffdm 5561 fcoi1 5575 fof 5618 dff1o2 5647 fvmptss2 5783 fvmptssdm 5793 fprg 5901 dff1o6 5985 tposeq 6522 el2oss1o 6720 nntri1 6773 nntri2or2 6775 nnsseleq 6778 infnninf 7470 infnninfOLD 7471 nninfwlpoimlemg 7521 exmidontri2or 7608 frec2uzf1od 10864 hashinfuni 11238 setsresg 13448 setsslid 13461 strle1g 13519 cncnpi 15454 hmeores 15541 limcimolemlt 15890 recnprss 15913 plycoeid3 15983 0nninf 17253 nninfall 17258 |
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