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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 9299 | . 2 ⊢ (𝐴 ∈ ℕ → (𝐴 + 1) ∈ ℕ) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (𝐴 + 1) ∈ ℕ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2209 (class class class)co 6079 1c1 8174 + caddc 8176 ℕcn 9287 |
| 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-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 4247 ax-cnex 8264 ax-resscn 8265 ax-1re 8267 ax-addrcl 8270 |
| This theorem 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 3714 df-pr 3715 df-op 3717 df-uni 3934 df-int 3969 df-br 4129 df-iota 5335 df-fv 5383 df-ov 6082 df-inn 9288 |
| This theorem is referenced by: exp3vallem 10960 bcpasc 11187 caucvgre 11730 resqrexlemdecn 11761 cvgratnnlemmn 12275 cvgratnnlemseq 12276 cvgratnnlemabsle 12277 eftlub 12440 eirraplem 12527 infpnlem1 13121 infpnlem2 13122 1arith 13129 oddennn 13266 exmidunben 13300 nninfdclemp1 13324 nninfdclemlt 13325 perfectlem1 16096 perfectlem2 16097 lgsdilem2 16138 cvgcmp2nlemabs 17055 trilpolemeq1 17063 trilpolemlt1 17064 nconstwlpolemgt0 17088 |
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