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Mirrors > Home > ILE Home > Th. List > snnzg | GIF version |
Description: The singleton of a set is not empty. (Contributed by NM, 14-Dec-2008.) |
Ref | Expression |
---|---|
snnzg | ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snidg 3599 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴}) | |
2 | ne0i 3410 | . 2 ⊢ (𝐴 ∈ {𝐴} → {𝐴} ≠ ∅) | |
3 | 1, 2 | syl 14 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2135 ≠ wne 2334 ∅c0 3404 {csn 3570 |
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 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-v 2723 df-dif 3113 df-nul 3405 df-sn 3576 |
This theorem is referenced by: snnz 3689 0nelop 4220 |
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