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| Mirrors > Home > MPE Home > Th. List > funfn | Structured version Visualization version GIF version | ||
| Description: A class is a function if and only if it is a function on its domain. (Contributed by NM, 13-Aug-2004.) |
| Ref | Expression |
|---|---|
| funfn | ⊢ (Fun 𝐴 ↔ 𝐴 Fn dom 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2737 | . . 3 ⊢ dom 𝐴 = dom 𝐴 | |
| 2 | 1 | biantru 529 | . 2 ⊢ (Fun 𝐴 ↔ (Fun 𝐴 ∧ dom 𝐴 = dom 𝐴)) |
| 3 | df-fn 6503 | . 2 ⊢ (𝐴 Fn dom 𝐴 ↔ (Fun 𝐴 ∧ dom 𝐴 = dom 𝐴)) | |
| 4 | 2, 3 | bitr4i 278 | 1 ⊢ (Fun 𝐴 ↔ 𝐴 Fn dom 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1542 dom cdm 5632 Fun wfun 6494 Fn wfn 6495 |
| 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 1912 ax-6 1969 ax-7 2010 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-ex 1782 df-cleq 2729 df-fn 6503 |
| This theorem is referenced by: funfnd 6531 funssxp 6698 funforn 6761 funbrfvb 6895 funopfvb 6896 ssimaex 6927 fvco 6940 fvco4i 6943 eqfunfv 6990 fvimacnvi 7006 unpreima 7017 respreima 7020 elrnrexdm 7043 elrnrexdmb 7044 ffvresb 7080 funiun 7102 funressn 7114 funresdfunsn 7145 funex 7175 elunirn 7207 suppval1 8118 funsssuppss 8142 smores 8294 rdgsucg 8364 rdglimg 8366 imafiOLD 9228 fundmfibi 9248 residfi 9250 mptfi 9263 ordtypelem6 9440 ordtypelem7 9441 harwdom 9508 ackbij2 10164 mptct 10460 smobeth 10509 hashkf 14267 hashfun 14372 fclim 15488 coapm 18007 psgnghm 21547 lindfrn 21788 elno3 27635 noextenddif 27648 noextendlt 27649 noextendgt 27650 nosupbnd2lem1 27695 noetasuplem4 27716 ausgrumgri 29252 dfnbgr3 29423 wlkiswwlks1 29952 vdn0conngrumgrv2 30283 hlimf 31324 adj1o 31981 abrexdomjm 32593 iunpreima 32650 fresf1o 32720 unipreima 32732 xppreima 32734 rnressnsn 32766 suppiniseg 32775 fdifsuppconst 32778 ressupprn 32779 mptctf 32805 orvcval2 34636 fineqvac 35291 fullfunfnv 36159 fullfunfv 36160 abrexdom 37978 diaf11N 41422 dibf11N 41534 imadomfi 42369 gneispace3 44486 fresfo 47405 funbrafvb 47513 funopafvb 47514 funbrafv22b 47607 funopafv2b 47608 dfclnbgr3 48183 grimuhgr 48244 |
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