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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 9254 | . 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 2205 (class class class)co 6052 1c1 8133 + caddc 8135 ℕcn 9242 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 ax-sep 4230 ax-cnex 8223 ax-resscn 8224 ax-1re 8226 ax-addrcl 8229 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-un 3217 df-in 3219 df-ss 3226 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-int 3952 df-br 4112 df-iota 5314 df-fv 5362 df-ov 6055 df-inn 9243 |
| This theorem is referenced by: exp3vallem 10909 bcpasc 11136 caucvgre 11674 resqrexlemdecn 11705 cvgratnnlemmn 12219 cvgratnnlemseq 12220 cvgratnnlemabsle 12221 eftlub 12384 eirraplem 12471 infpnlem1 13065 infpnlem2 13066 1arith 13073 oddennn 13164 exmidunben 13198 nninfdclemp1 13222 nninfdclemlt 13223 perfectlem1 15916 perfectlem2 15917 lgsdilem2 15958 cvgcmp2nlemabs 16865 trilpolemeq1 16873 trilpolemlt1 16874 nconstwlpolemgt0 16899 |
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