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| Mirrors > Home > ILE Home > Th. List > n0r | GIF version | ||
| Description: An inhabited class is nonempty. See n0rf 3463 for more discussion. (Contributed by Jim Kingdon, 31-Jul-2018.) | 
| Ref | Expression | 
|---|---|
| n0r | ⊢ (∃𝑥 𝑥 ∈ 𝐴 → 𝐴 ≠ ∅) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | nfcv 2339 | . 2 ⊢ Ⅎ𝑥𝐴 | |
| 2 | 1 | n0rf 3463 | 1 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → 𝐴 ≠ ∅) | 
| Colors of variables: wff set class | 
| Syntax hints: → wi 4 ∃wex 1506 ∈ wcel 2167 ≠ wne 2367 ∅c0 3450 | 
| 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 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 | 
| This theorem depends on definitions: df-bi 117 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-v 2765 df-dif 3159 df-nul 3451 | 
| This theorem is referenced by: neq0r 3465 opnzi 4268 elqsn0 6663 fin0 6946 infn0 6966 fiubm 10920 fsumcllem 11564 fprodcllem 11771 setsfun0 12714 gsumwsubmcl 13128 gsumwmhm 13130 | 
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