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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nnn0 | Structured version Visualization version GIF version | ||
| Description: The set of positive integers is nonempty. (Contributed by Glauco Siliprandi, 8-Apr-2021.) |
| Ref | Expression |
|---|---|
| nnn0 | ⊢ ℕ ≠ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1nn 12244 | . 2 ⊢ 1 ∈ ℕ | |
| 2 | 1 | ne0ii 4303 | 1 ⊢ ℕ ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2964 ∅c0 4292 1c1 11101 ℕcn 12233 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5259 ax-nul 5271 ax-pr 5405 ax-un 7733 ax-1cn 11158 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-ral 3086 df-rex 3096 df-reu 3376 df-rab 3423 df-v 3463 df-sbc 3752 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7414 df-om 7863 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-nn 12234 |
| This theorem is referenced by: iocborel 46997 hoicvr 47189 iunhoiioo 47317 iccvonmbllem 47319 preimageiingt 47361 preimaleiinlt 47362 salpreimagtge 47366 salpreimaltle 47367 smflimlem1 47412 |
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