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Mirrors > Home > ILE Home > Th. List > 0nelfun | GIF version |
Description: A function does not contain the empty set. (Contributed by BJ, 26-Nov-2021.) |
Ref | Expression |
---|---|
0nelfun | ⊢ (Fun 𝑅 → ∅ ∉ 𝑅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | funrel 5255 | . 2 ⊢ (Fun 𝑅 → Rel 𝑅) | |
2 | 0nelrel 4693 | . 2 ⊢ (Rel 𝑅 → ∅ ∉ 𝑅) | |
3 | 1, 2 | syl 14 | 1 ⊢ (Fun 𝑅 → ∅ ∉ 𝑅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∉ wnel 2455 ∅c0 3437 Rel wrel 4652 Fun wfun 5232 |
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-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-14 2163 ax-ext 2171 ax-sep 4139 ax-pow 4195 ax-pr 4230 |
This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-v 2754 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-nul 3438 df-pw 3595 df-sn 3616 df-pr 3617 df-op 3619 df-opab 4083 df-xp 4653 df-rel 4654 df-fun 5240 |
This theorem is referenced by: (None) |
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