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Theorem bj-peano2 16965
Description: Constructive proof of peano2 4742. Temporary note: another possibility is to simply replace sucexg 4645 with bj-sucexg 16948 in the proof of peano2 4742. (Contributed by BJ, 18-Nov-2019.) (Proof modification is discouraged.)
Assertion
Ref Expression
bj-peano2 (𝐴 ∈ ω → suc 𝐴 ∈ ω)

Proof of Theorem bj-peano2
StepHypRef Expression
1 bj-omind 16960 . 2 Ind ω
2 bj-indsuc 16954 . 2 (Ind ω → (𝐴 ∈ ω → suc 𝐴 ∈ ω))
31, 2ax-mp 5 1 (𝐴 ∈ ω → suc 𝐴 ∈ ω)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4  wcel 2209  suc csuc 4510  ωcom 4737  Ind wind 16952
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  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-14 2212  ax-ext 2220  ax-nul 4259  ax-pr 4346  ax-un 4578  ax-bd0 16839  ax-bdor 16842  ax-bdex 16845  ax-bdeq 16846  ax-bdel 16847  ax-bdsep 16910
This proof depends on definitions:  df-bi 117  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-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-nul 3521  df-sn 3715  df-pr 3716  df-uni 3936  df-int 3971  df-suc 4516  df-iom 4738  df-bj-ind 16953
This theorem is used by:  bj-nn0suc  16990  bj-nn0sucALT  17004
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