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| Mirrors > Home > ILE Home > Th. List > peano2nnd | GIF version | ||
| Description: Peano postulate: a successor of a positive integer is a positive integer. (Contributed by Mario Carneiro, 27-May-2016.) |
| Ref | Expression |
|---|---|
| nnred.1 | ⊢ (𝜑 → 𝐴 ∈ ℕ) |
| Ref | Expression |
|---|---|
| peano2nnd | ⊢ (𝜑 → (𝐴 + 1) ∈ ℕ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnred.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℕ) | |
| 2 | peano2nn 9326 | . 2 ⊢ (𝐴 ∈ ℕ → (𝐴 + 1) ∈ ℕ) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 + 1) ∈ ℕ) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2209 (class class class)co 6088 1c1 8187 + caddc 8189 ℕcn 9314 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-sep 4251 ax-cnex 8277 ax-resscn 8278 ax-1re 8280 ax-addrcl 8283 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4132 df-iota 5340 df-fv 5388 df-ov 6091 df-inn 9315 |
| This theorem is used by: exp3vallem 10999 bcpasc 11227 caucvgre 11770 resqrexlemdecn 11801 cvgratnnlemmn 12318 cvgratnnlemseq 12319 cvgratnnlemabsle 12320 eftlub 12483 eirraplem 12570 infpnlem1 13168 infpnlem2 13169 1arith 13176 oddennn 13342 exmidunben 13376 nninfdclemp1 13400 nninfdclemlt 13401 perfectlem1 16311 perfectlem2 16312 bclbnd 16319 lgsdilem2 16372 cvgcmp2nlemabs 17299 trilpolemeq1 17308 trilpolemlt1 17309 nconstwlpolemgt0 17333 |
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