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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 5148 | . 2 ⊢ (Fun 𝑅 → Rel 𝑅) | |
2 | 0nelrel 4593 | . 2 ⊢ (Rel 𝑅 → ∅ ∉ 𝑅) | |
3 | 1, 2 | syl 14 | 1 ⊢ (Fun 𝑅 → ∅ ∉ 𝑅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∉ wnel 2404 ∅c0 3368 Rel wrel 4552 Fun wfun 5125 |
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-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-nel 2405 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-opab 3998 df-xp 4553 df-rel 4554 df-fun 5133 |
This theorem is referenced by: (None) |
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