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Mirrors > Home > ILE Home > Th. List > structfung | GIF version |
Description: The converse of the converse of a structure is a function. Closed form of structfun 11904. (Contributed by AV, 12-Nov-2021.) |
Ref | Expression |
---|---|
structfung | ⊢ (𝐹 Struct 𝑋 → Fun ◡◡𝐹) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | structn0fun 11899 | . 2 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) | |
2 | structcnvcnv 11902 | . . 3 ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 = (𝐹 ∖ {∅})) | |
3 | 2 | funeqd 5115 | . 2 ⊢ (𝐹 Struct 𝑋 → (Fun ◡◡𝐹 ↔ Fun (𝐹 ∖ {∅}))) |
4 | 1, 3 | mpbird 166 | 1 ⊢ (𝐹 Struct 𝑋 → Fun ◡◡𝐹) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∖ cdif 3038 ∅c0 3333 {csn 3497 class class class wbr 3899 ◡ccnv 4508 Fun wfun 5087 Struct cstr 11882 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-pow 4068 ax-pr 4101 |
This theorem depends on definitions: df-bi 116 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ne 2286 df-ral 2398 df-rex 2399 df-rab 2402 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-br 3900 df-opab 3960 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-iota 5058 df-fun 5095 df-fv 5101 df-struct 11888 |
This theorem is referenced by: structfun 11904 opelstrsl 11982 |
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