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Mirrors > Home > ILE Home > Th. List > fofun | GIF version |
Description: An onto mapping is a function. (Contributed by NM, 29-Mar-2008.) |
Ref | Expression |
---|---|
fofun | ⊢ (𝐹:𝐴–onto→𝐵 → Fun 𝐹) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fof 5345 | . 2 ⊢ (𝐹:𝐴–onto→𝐵 → 𝐹:𝐴⟶𝐵) | |
2 | ffun 5275 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → Fun 𝐹) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝐹:𝐴–onto→𝐵 → Fun 𝐹) |
Colors of variables: wff set class |
Syntax hints: → wi 4 Fun wfun 5117 ⟶wf 5119 –onto→wfo 5121 |
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-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-in 3077 df-ss 3084 df-fn 5126 df-f 5127 df-fo 5129 |
This theorem is referenced by: foimacnv 5385 resdif 5389 fococnv2 5393 fornex 6013 ctssdccl 6996 suplocexprlem2b 7522 suplocexprlemmu 7526 suplocexprlemdisj 7528 suplocexprlemloc 7529 suplocexprlemub 7531 suplocexprlemlub 7532 ennnfonelemex 11927 ctinf 11943 |
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