Users' Mathboxes Mathbox for BJ < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >   Mathboxes  >  speano5 GIF version

Theorem speano5 16475
Description: Version of peano5 4694 when 𝐴 is assumed to be a set, allowing a proof from the core axioms of CZF. (Contributed by BJ, 19-Nov-2019.) (Proof modification is discouraged.)
Assertion
Ref Expression
speano5 ((𝐴𝑉 ∧ ∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥𝐴 → suc 𝑥𝐴)) → ω ⊆ 𝐴)
Distinct variable group:   𝑥,𝐴
Allowed substitution hint:   𝑉(𝑥)

Proof of Theorem speano5
StepHypRef Expression
1 bj-omex 16473 . . . 4 ω ∈ V
2 bj-inex 16438 . . . 4 ((ω ∈ V ∧ 𝐴𝑉) → (ω ∩ 𝐴) ∈ V)
31, 2mpan 424 . . 3 (𝐴𝑉 → (ω ∩ 𝐴) ∈ V)
4 peano5set 16471 . . 3 ((ω ∩ 𝐴) ∈ V → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥𝐴 → suc 𝑥𝐴)) → ω ⊆ 𝐴))
53, 4syl 14 . 2 (𝐴𝑉 → ((∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥𝐴 → suc 𝑥𝐴)) → ω ⊆ 𝐴))
653impib 1225 1 ((𝐴𝑉 ∧ ∅ ∈ 𝐴 ∧ ∀𝑥 ∈ ω (𝑥𝐴 → suc 𝑥𝐴)) → ω ⊆ 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1002  wcel 2200  wral 2508  Vcvv 2800  cin 3197  wss 3198  c0 3492  suc csuc 4460  ωcom 4686
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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-nul 4213  ax-pr 4297  ax-un 4528  ax-bd0 16344  ax-bdan 16346  ax-bdor 16347  ax-bdex 16350  ax-bdeq 16351  ax-bdel 16352  ax-bdsb 16353  ax-bdsep 16415  ax-infvn 16472
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2802  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-sn 3673  df-pr 3674  df-uni 3892  df-int 3927  df-suc 4466  df-iom 4687  df-bdc 16372  df-bj-ind 16458
This theorem is referenced by:  findset  16476
  Copyright terms: Public domain W3C validator