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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 7596 recidpirq 8225 axprecex 8247 negeq0 8580 muleqadd 8998 fihasheq0 11232 hashfibc 11283 hashf1lem2 11286 cjne0 11674 sqrt00 11806 sqrtmsq2i 11901 cbvsum 12126 fsump1i 12200 mertenslem2 12303 cbvprod 12325 absefib 12538 efieq1re 12539 isnsg4 14015 isassa 15002 plyco 15860 lgsdinn0 16167 m1lgs 16204 upgrex 16344 uhgr2edg 16447 usgredg2vlem1 16463 usgredg2vlem2 16464 ushgredgedg 16467 ushgredgedgloop 16469 exmidnotnotr 17036 iswomninnlem 17099 |
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