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Mirrors > Home > ILE Home > Th. List > ne0i | GIF version |
Description: If a set has elements, it is not empty. A set with elements is also inhabited, see elex2 2776. (Contributed by NM, 31-Dec-1993.) |
Ref | Expression |
---|---|
ne0i | ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i 3453 | . 2 ⊢ (𝐵 ∈ 𝐴 → ¬ 𝐴 = ∅) | |
2 | 1 | neneqad 2443 | 1 ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2164 ≠ wne 2364 ∅c0 3447 |
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 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2175 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1472 df-sb 1774 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-v 2762 df-dif 3156 df-nul 3448 |
This theorem is referenced by: ne0d 3455 ne0ii 3457 vn0 3458 inelcm 3508 rzal 3545 rexn0 3546 snnzg 3736 prnz 3741 tpnz 3744 brne0 4079 onn0 4432 nn0eln0 4653 ordge1n0im 6491 nnmord 6572 map0g 6744 phpm 6923 fiintim 6987 addclpi 7389 mulclpi 7390 uzn0 9611 iccsupr 10035 ringn0 13559 |
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