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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 13085 | . 2 ⊢ (𝐹 Struct 𝑋 → (𝑋 ∈ ( ≤ ∩ (ℕ × ℕ)) ∧ Fun (𝐹 ∖ {∅}) ∧ dom 𝐹 ⊆ (...‘𝑋))) | |
| 2 | 1 | simp2d 1034 | 1 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2200 ∖ cdif 3195 ∩ cin 3197 ⊆ wss 3198 ∅c0 3492 {csn 3667 class class class wbr 4086 × cxp 4721 dom cdm 4723 Fun wfun 5318 ‘cfv 5324 ≤ cle 8208 ℕcn 9136 ...cfz 10236 Struct cstr 13071 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-iota 5284 df-fun 5326 df-fv 5332 df-struct 13077 |
| This theorem is referenced by: structcnvcnv 13091 structfung 13092 setsn0fun 13112 basvtxval2dom 15878 edgfiedgval2dom 15879 structiedg0val 15884 |
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