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| Mirrors > Home > ILE Home > Th. List > eqeq2i | GIF version | ||
| Description: Inference from equality to equivalence of equalities. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| eqeq2i.1 | ⊢ 𝐴 = 𝐵 |
| Ref | Expression |
|---|---|
| eqeq2i | ⊢ (𝐶 = 𝐴 ↔ 𝐶 = 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq2i.1 | . 2 ⊢ 𝐴 = 𝐵 | |
| 2 | eqeq2 2248 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 = 𝐴 ↔ 𝐶 = 𝐵)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐶 = 𝐴 ↔ 𝐶 = 𝐵) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ↔ wb 105 = wceq 1402 |
| 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-gen 1502 ax-4 1563 ax-17 1579 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 |
| This theorem is used by: eqtri 2259 eqabbw 2375 rabid2 2729 ssalel 3235 equncom 3374 ab0w 3550 preq12b 3895 preqsn 3900 opeqpr 4394 orddif 4694 dfrel4v 5239 dfiota2 5338 funopg 5411 funopsn 5891 fnressn 5901 fressnfv 5902 riotaeqimp 6063 acexmidlemph 6078 fnovim 6197 tpossym 6547 qsid 6874 mapsncnv 6977 ixpsnf1o 7018 pw1fin 7217 ss1o0el1o 7220 unfiexmid 7225 onntri35 7597 recidpirq 8226 axprecex 8248 negeq0 8582 muleqadd 9001 fihasheq0 11248 hashfibc 11299 hashf1lem2 11302 cjne0 11690 sqrt00 11822 sqrtmsq2i 11918 cbvsum 12145 fsump1i 12219 mertenslem2 12322 cbvprod 12344 absefib 12557 efieq1re 12558 isnsg4 14068 isassa 15086 plyco 15951 ppiqub 16254 lgsdinn0 16333 m1lgs 16370 upgrex 16510 uhgr2edg 16613 usgredg2vlem1 16629 usgredg2vlem2 16630 ushgredgedg 16633 ushgredgedgloop 16635 exmidnotnotr 17202 iswomninnlem 17266 |
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