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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 6167 | . 2 ⊢ ◡◡𝐴 ⊆ 𝐴 | |
| 2 | funss 6535 | . 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 3914 ◡ccnv 5637 Fun wfun 6505 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pr 5387 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2066 df-clab 2708 df-cleq 2721 df-clel 2803 df-rab 3406 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4297 df-if 4489 df-sn 4590 df-pr 4592 df-op 4596 df-br 5108 df-opab 5170 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-fun 6513 |
| This theorem is referenced by: funcnvres2 6596 inpreima 7036 difpreima 7037 f1oresrab 7099 sbthlem8 9058 fin1a2lem7 10359 cnclima 23155 iscncl 23156 qtopcld 23600 qtoprest 23604 qtopcmap 23606 rnelfmlem 23839 fmfnfmlem3 23843 mbfimaicc 25532 ismbf3d 25555 i1fd 25582 gsummpt2co 32988 |
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