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| Mirrors > Home > ILE Home > Th. List > 0nelfun | Unicode version | ||
| Description: A function does not contain the empty set. (Contributed by BJ, 26-Nov-2021.) |
| Ref | Expression |
|---|---|
| 0nelfun |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funrel 5368 |
. 2
| |
| 2 | 0nelrel 4795 |
. 2
| |
| 3 | 1, 2 | syl 14 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2206 ax-ext 2214 ax-sep 4227 ax-pow 4286 ax-pr 4321 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-v 2814 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-opab 4171 df-xp 4754 df-rel 4755 df-fun 5353 |
| This theorem is referenced by: (None) |
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