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| Mirrors > Home > MPE Home > Th. List > funcnvcnv | Structured version Visualization version GIF version | ||
| Description: The double converse of a function is a function. (Contributed by NM, 21-Sep-2004.) |
| Ref | Expression |
|---|---|
| funcnvcnv | ⊢ (Fun 𝐴 → Fun ◡◡𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnvcnvss 6158 | . 2 ⊢ ◡◡𝐴 ⊆ 𝐴 | |
| 2 | funss 6517 | . 2 ⊢ (◡◡𝐴 ⊆ 𝐴 → (Fun 𝐴 → Fun ◡◡𝐴)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (Fun 𝐴 → Fun ◡◡𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ⊆ wss 3889 ◡ccnv 5630 Fun wfun 6492 |
| 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-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-br 5086 df-opab 5148 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-fun 6500 |
| This theorem is referenced by: funcnvres2 6578 inpreima 7016 difpreima 7017 f1oresrab 7080 sbthlem8 9032 fin1a2lem7 10328 cnclima 23233 iscncl 23234 qtopcld 23678 qtoprest 23682 qtopcmap 23684 rnelfmlem 23917 fmfnfmlem3 23921 mbfimaicc 25598 ismbf3d 25621 i1fd 25648 gsummpt2co 33109 |
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