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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 6152 | . 2 ⊢ ◡◡𝐴 ⊆ 𝐴 | |
| 2 | funss 6511 | . 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 3901 ◡ccnv 5623 Fun wfun 6486 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-br 5099 df-opab 5161 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-fun 6494 |
| This theorem is referenced by: funcnvres2 6572 inpreima 7009 difpreima 7010 f1oresrab 7072 sbthlem8 9022 fin1a2lem7 10316 cnclima 23212 iscncl 23213 qtopcld 23657 qtoprest 23661 qtopcmap 23663 rnelfmlem 23896 fmfnfmlem3 23900 mbfimaicc 25588 ismbf3d 25611 i1fd 25638 gsummpt2co 33131 |
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