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Mirrors > Home > ILE Home > Th. List > 6nn | GIF version |
Description: 6 is a positive integer. (Contributed by Mario Carneiro, 15-Sep-2013.) |
Ref | Expression |
---|---|
6nn | ⊢ 6 ∈ ℕ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-6 8911 | . 2 ⊢ 6 = (5 + 1) | |
2 | 5nn 9012 | . . 3 ⊢ 5 ∈ ℕ | |
3 | peano2nn 8860 | . . 3 ⊢ (5 ∈ ℕ → (5 + 1) ∈ ℕ) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ (5 + 1) ∈ ℕ |
5 | 1, 4 | eqeltri 2237 | 1 ⊢ 6 ∈ ℕ |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2135 (class class class)co 5836 1c1 7745 + caddc 7747 ℕcn 8848 5c5 8902 6c6 8903 |
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-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 ax-sep 4094 ax-cnex 7835 ax-resscn 7836 ax-1re 7838 ax-addrcl 7841 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-un 3115 df-in 3117 df-ss 3124 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-br 3977 df-iota 5147 df-fv 5190 df-ov 5839 df-inn 8849 df-2 8907 df-3 8908 df-4 8909 df-5 8910 df-6 8911 |
This theorem is referenced by: 7nn 9014 6nn0 9126 ef01bndlem 11683 sin01bnd 11684 cos01bnd 11685 6gcd4e2 11913 6lcm4e12 11998 vscandx 12461 vscaid 12462 vscaslid 12463 lmodstrd 12464 ipsstrd 12472 sincos3rdpi 13305 pigt3 13306 ex-dvds 13448 ex-gcd 13449 |
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