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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 2705. (Contributed by NM, 31-Dec-1993.) |
Ref | Expression |
---|---|
ne0i | ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | n0i 3373 | . 2 ⊢ (𝐵 ∈ 𝐴 → ¬ 𝐴 = ∅) | |
2 | 1 | neneqad 2388 | 1 ⊢ (𝐵 ∈ 𝐴 → 𝐴 ≠ ∅) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1481 ≠ wne 2309 ∅c0 3368 |
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-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-v 2691 df-dif 3078 df-nul 3369 |
This theorem is referenced by: ne0d 3375 ne0ii 3377 vn0 3378 inelcm 3428 rzal 3465 rexn0 3466 snnzg 3648 prnz 3653 tpnz 3656 brne0 3985 onn0 4330 nn0eln0 4541 ordge1n0im 6341 nnmord 6421 map0g 6590 phpm 6767 fiintim 6825 addclpi 7159 mulclpi 7160 uzn0 9365 iccsupr 9779 |
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