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| Mirrors > Home > ILE Home > Th. List > structn0fun | GIF version | ||
| Description: A structure without the empty set is a function. (Contributed by AV, 13-Nov-2021.) |
| Ref | Expression |
|---|---|
| structn0fun | ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | isstruct2im 13345 | . 2 ⊢ (𝐹 Struct 𝑋 → (𝑋 ∈ ( ≤ ∩ (ℕ × ℕ)) ∧ Fun (𝐹 ∖ {∅}) ∧ dom 𝐹 ⊆ (...‘𝑋))) | |
| 2 | 1 | simp2d 1041 | 1 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2209 ∖ cdif 3217 ∩ cin 3219 ⊆ wss 3220 ∅c0 3520 {csn 3708 class class class wbr 4128 × cxp 4770 dom cdm 4772 Fun wfun 5369 ‘cfv 5375 ≤ cle 8355 ℕcn 9287 ...cfz 10394 Struct cstr 13331 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-br 4129 df-opab 4191 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-iota 5335 df-fun 5377 df-fv 5383 df-struct 13337 |
| This theorem is referenced by: structcnvcnv 13351 structfung 13352 setsn0fun 13372 basvtxval2dom 16258 edgfiedgval2dom 16259 structiedg0val 16264 |
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