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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 4297 pwssunim 4429 poeq2 4445 seeq1 4484 seeq2 4485 trsucss 4568 onsucelsucr 4655 xp11m 5226 funeq 5397 fnresdm 5492 fssxp 5555 ffdm 5558 fcoi1 5572 fof 5615 dff1o2 5644 fvmptss2 5780 fvmptssdm 5790 fprg 5898 dff1o6 5982 tposeq 6518 el2oss1o 6716 nntri1 6769 nntri2or2 6771 nnsseleq 6774 infnninf 7464 infnninfOLD 7465 nninfwlpoimlemg 7515 exmidontri2or 7602 frec2uzf1od 10843 hashinfuni 11216 setsresg 13390 setsslid 13403 strle1g 13460 cncnpi 15329 hmeores 15416 limcimolemlt 15765 recnprss 15788 plycoeid3 15858 0nninf 17047 nninfall 17052 |
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