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Mirrors > Home > MPE Home > Th. List > pinn | Structured version Visualization version GIF version |
Description: A positive integer is a natural number. (Contributed by NM, 15-Aug-1995.) (New usage is discouraged.) |
Ref | Expression |
---|---|
pinn | ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ni 10296 | . . 3 ⊢ N = (ω ∖ {∅}) | |
2 | difss 4110 | . . 3 ⊢ (ω ∖ {∅}) ⊆ ω | |
3 | 1, 2 | eqsstri 4003 | . 2 ⊢ N ⊆ ω |
4 | 3 | sseli 3965 | 1 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2114 ∖ cdif 3935 ∅c0 4293 {csn 4569 ωcom 7582 Ncnpi 10268 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-v 3498 df-dif 3941 df-in 3945 df-ss 3954 df-ni 10296 |
This theorem is referenced by: pion 10303 piord 10304 mulidpi 10310 addclpi 10316 mulclpi 10317 addcompi 10318 addasspi 10319 mulcompi 10320 mulasspi 10321 distrpi 10322 addcanpi 10323 mulcanpi 10324 addnidpi 10325 ltexpi 10326 ltapi 10327 ltmpi 10328 indpi 10331 |
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