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Mirrors > Home > MPE Home > Th. List > f1fveq | Structured version Visualization version GIF version |
Description: Equality of function values for a one-to-one function. (Contributed by NM, 11-Feb-1997.) |
Ref | Expression |
---|---|
f1fveq | ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) ↔ 𝐶 = 𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f1veqaeq 6993 | . 2 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) → 𝐶 = 𝐷)) | |
2 | fveq2 6645 | . 2 ⊢ (𝐶 = 𝐷 → (𝐹‘𝐶) = (𝐹‘𝐷)) | |
3 | 1, 2 | impbid1 228 | 1 ⊢ ((𝐹:𝐴–1-1→𝐵 ∧ (𝐶 ∈ 𝐴 ∧ 𝐷 ∈ 𝐴)) → ((𝐹‘𝐶) = (𝐹‘𝐷) ↔ 𝐶 = 𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ∈ wcel 2111 –1-1→wf1 6321 ‘cfv 6324 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fv 6332 |
This theorem is referenced by: f1elima 6999 f1dom3fv3dif 7004 cocan1 7025 isof1oidb 7056 isosolem 7079 f1oiso 7083 weniso 7086 f1oweALT 7655 2dom 8565 xpdom2 8595 wemapwe 9144 fseqenlem1 9435 dfac12lem2 9555 infpssrlem4 9717 fin23lem28 9751 isf32lem7 9770 iundom2g 9951 canthnumlem 10059 canthwelem 10061 canthp1lem2 10064 pwfseqlem4 10073 seqf1olem1 13405 bitsinv2 15782 bitsf1 15785 sadasslem 15809 sadeq 15811 bitsuz 15813 eulerthlem2 16109 f1ocpbllem 16789 f1ovscpbl 16791 fthi 17180 ghmf1 18379 f1omvdmvd 18563 odf1 18681 dprdf1o 19147 zntoslem 20248 iporthcom 20324 ply1scln0 20920 cnt0 21951 cnhaus 21959 imasdsf1olem 22980 imasf1oxmet 22982 dyadmbl 24204 vitalilem3 24214 dvcnvlem 24579 facth1 24765 usgredg2v 27017 cycpmco2lem6 30823 erdszelem9 32559 cvmliftmolem1 32641 msubff1 32916 metf1o 35193 rngoisocnv 35419 laut11 37382 gicabl 40043 fourierdlem50 42798 |
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