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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 7008 | . 2 ⊢ (ω ≼ 𝐴 → ∃𝑥 𝑥 ∈ 𝐴) | |
| 2 | n0r 3475 | . 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 1516 ∈ wcel 2177 ≠ wne 2377 ∅c0 3461 class class class wbr 4047 ωcom 4642 ≼ cdom 6833 |
| 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 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-nul 4174 ax-pow 4222 ax-pr 4257 ax-un 4484 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-ral 2490 df-rex 2491 df-v 2775 df-sbc 3000 df-dif 3169 df-un 3171 df-in 3173 df-ss 3180 df-nul 3462 df-pw 3619 df-sn 3640 df-pr 3641 df-op 3643 df-uni 3853 df-int 3888 df-br 4048 df-opab 4110 df-id 4344 df-iom 4643 df-xp 4685 df-rel 4686 df-cnv 4687 df-co 4688 df-dm 4689 df-rn 4690 df-iota 5237 df-fun 5278 df-fn 5279 df-f 5280 df-f1 5281 df-fv 5284 df-dom 6836 |
| This theorem is referenced by: (None) |
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