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| Mirrors > Home > ILE Home > Th. List > infn0 | GIF version | ||
| Description: An infinite set is not empty. (Contributed by NM, 23-Oct-2004.) |
| Ref | Expression |
|---|---|
| infn0 | ⊢ (ω ≼ 𝐴 → 𝐴 ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | infm 7034 | . 2 ⊢ (ω ≼ 𝐴 → ∃𝑥 𝑥 ∈ 𝐴) | |
| 2 | n0r 3485 | . 2 ⊢ (∃𝑥 𝑥 ∈ 𝐴 → 𝐴 ≠ ∅) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (ω ≼ 𝐴 → 𝐴 ≠ ∅) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∃wex 1518 ∈ wcel 2180 ≠ wne 2380 ∅c0 3471 class class class wbr 4062 ωcom 4659 ≼ cdom 6856 |
| 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 617 ax-in2 618 ax-io 713 ax-5 1473 ax-7 1474 ax-gen 1475 ax-ie1 1519 ax-ie2 1520 ax-8 1530 ax-10 1531 ax-11 1532 ax-i12 1533 ax-bndl 1535 ax-4 1536 ax-17 1552 ax-i9 1556 ax-ial 1560 ax-i5r 1561 ax-13 2182 ax-14 2183 ax-ext 2191 ax-sep 4181 ax-nul 4189 ax-pow 4237 ax-pr 4272 ax-un 4501 |
| This theorem depends on definitions: df-bi 117 df-3an 985 df-tru 1378 df-fal 1381 df-nf 1487 df-sb 1789 df-eu 2060 df-mo 2061 df-clab 2196 df-cleq 2202 df-clel 2205 df-nfc 2341 df-ne 2381 df-ral 2493 df-rex 2494 df-v 2781 df-sbc 3009 df-dif 3179 df-un 3181 df-in 3183 df-ss 3190 df-nul 3472 df-pw 3631 df-sn 3652 df-pr 3653 df-op 3655 df-uni 3868 df-int 3903 df-br 4063 df-opab 4125 df-id 4361 df-iom 4660 df-xp 4702 df-rel 4703 df-cnv 4704 df-co 4705 df-dm 4706 df-rn 4707 df-iota 5254 df-fun 5296 df-fn 5297 df-f 5298 df-f1 5299 df-fv 5302 df-dom 6859 |
| This theorem is referenced by: (None) |
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