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Mirrors > Home > ILE Home > Th. List > 0nep0 | GIF version |
Description: The empty set and its power set are not equal. (Contributed by NM, 23-Dec-1993.) |
Ref | Expression |
---|---|
0nep0 | ⊢ ∅ ≠ {∅} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ex 4109 | . . 3 ⊢ ∅ ∈ V | |
2 | 1 | snnz 3695 | . 2 ⊢ {∅} ≠ ∅ |
3 | 2 | necomi 2421 | 1 ⊢ ∅ ≠ {∅} |
Colors of variables: wff set class |
Syntax hints: ≠ wne 2336 ∅c0 3409 {csn 3576 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 ax-nul 4108 |
This theorem depends on definitions: df-bi 116 df-tru 1346 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-v 2728 df-dif 3118 df-nul 3410 df-sn 3582 |
This theorem is referenced by: 0inp0 4145 opthprc 4655 2dom 6771 exmidpw 6874 exmidaclem 7164 pw1dom2 7183 |
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