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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 6175 | . 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 3902 ◡ccnv 5642 Fun wfun 6510 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5243 ax-pr 5387 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-clab 2740 df-cleq 2753 df-clel 2836 df-rab 3414 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-sn 4580 df-pr 4582 df-op 4586 df-br 5098 df-opab 5160 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-res 5655 df-fun 6518 |
| This theorem is referenced by: funcnvres2 6596 inpreima 7040 difpreima 7041 f1oresrab 7104 sbthlem8 9060 fin1a2lem7 10357 cnclima 23316 iscncl 23317 qtopcld 23761 qtoprest 23765 qtopcmap 23767 rnelfmlem 24000 fmfnfmlem3 24004 mbfimaicc 25681 ismbf3d 25704 i1fd 25731 gsummpt2co 33189 |
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