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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 5392 | . 2 ⊢ (Fun 𝑅 → Rel 𝑅) | |
| 2 | 0nelrel 4819 | . 2 ⊢ (Rel 𝑅 → ∅ ∉ 𝑅) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (Fun 𝑅 → ∅ ∉ 𝑅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∉ wnel 2515 ∅c0 3520 Rel wrel 4777 Fun wfun 5369 |
| 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 623 ax-in2 624 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-fal 1408 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-opab 4191 df-xp 4778 df-rel 4779 df-fun 5377 |
| This theorem is referenced by: (None) |
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