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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 12412. (Contributed by AV, 12-Nov-2021.) |
Ref | Expression |
---|---|
structfung | ⊢ (𝐹 Struct 𝑋 → Fun ◡◡𝐹) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | structn0fun 12407 | . 2 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) | |
2 | structcnvcnv 12410 | . . 3 ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 = (𝐹 ∖ {∅})) | |
3 | 2 | funeqd 5210 | . 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 3113 ∅c0 3409 {csn 3576 class class class wbr 3982 ◡ccnv 4603 Fun wfun 5182 Struct cstr 12390 |
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 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-ral 2449 df-rex 2450 df-rab 2453 df-v 2728 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 df-struct 12396 |
This theorem is referenced by: structfun 12412 opelstrsl 12491 |
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