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

Theorem bdsetindis 13094
Description: Axiom of bounded set induction using implicit substitutions. (Contributed by BJ, 22-Nov-2019.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
bdsetindis.bd BOUNDED 𝜑
bdsetindis.nf0 𝑥𝜓
bdsetindis.nf1 𝑥𝜒
bdsetindis.nf2 𝑦𝜑
bdsetindis.nf3 𝑦𝜓
bdsetindis.1 (𝑥 = 𝑧 → (𝜑𝜓))
bdsetindis.2 (𝑥 = 𝑦 → (𝜒𝜑))
Assertion
Ref Expression
bdsetindis (∀𝑦(∀𝑧𝑦 𝜓𝜒) → ∀𝑥𝜑)
Distinct variable groups:   𝑥,𝑦,𝑧   𝜑,𝑧
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑦,𝑧)   𝜒(𝑥,𝑦,𝑧)

Proof of Theorem bdsetindis
StepHypRef Expression
1 nfcv 2258 . . . . 5 𝑥𝑦
2 bdsetindis.nf0 . . . . 5 𝑥𝜓
31, 2nfralxy 2448 . . . 4 𝑥𝑧𝑦 𝜓
4 bdsetindis.nf1 . . . 4 𝑥𝜒
53, 4nfim 1536 . . 3 𝑥(∀𝑧𝑦 𝜓𝜒)
6 nfcv 2258 . . . . 5 𝑦𝑥
7 bdsetindis.nf3 . . . . 5 𝑦𝜓
86, 7nfralxy 2448 . . . 4 𝑦𝑧𝑥 𝜓
9 bdsetindis.nf2 . . . 4 𝑦𝜑
108, 9nfim 1536 . . 3 𝑦(∀𝑧𝑥 𝜓𝜑)
11 raleq 2603 . . . . 5 (𝑦 = 𝑥 → (∀𝑧𝑦 𝜓 ↔ ∀𝑧𝑥 𝜓))
1211biimprd 157 . . . 4 (𝑦 = 𝑥 → (∀𝑧𝑥 𝜓 → ∀𝑧𝑦 𝜓))
13 bdsetindis.2 . . . . 5 (𝑥 = 𝑦 → (𝜒𝜑))
1413equcoms 1669 . . . 4 (𝑦 = 𝑥 → (𝜒𝜑))
1512, 14imim12d 74 . . 3 (𝑦 = 𝑥 → ((∀𝑧𝑦 𝜓𝜒) → (∀𝑧𝑥 𝜓𝜑)))
165, 10, 15cbv3 1705 . 2 (∀𝑦(∀𝑧𝑦 𝜓𝜒) → ∀𝑥(∀𝑧𝑥 𝜓𝜑))
17 bdsetindis.1 . . . . . 6 (𝑥 = 𝑧 → (𝜑𝜓))
182, 17bj-sbime 12907 . . . . 5 ([𝑧 / 𝑥]𝜑𝜓)
1918ralimi 2472 . . . 4 (∀𝑧𝑥 [𝑧 / 𝑥]𝜑 → ∀𝑧𝑥 𝜓)
2019imim1i 60 . . 3 ((∀𝑧𝑥 𝜓𝜑) → (∀𝑧𝑥 [𝑧 / 𝑥]𝜑𝜑))
2120alimi 1416 . 2 (∀𝑥(∀𝑧𝑥 𝜓𝜑) → ∀𝑥(∀𝑧𝑥 [𝑧 / 𝑥]𝜑𝜑))
22 bdsetindis.bd . . 3 BOUNDED 𝜑
2322ax-bdsetind 13093 . 2 (∀𝑥(∀𝑧𝑥 [𝑧 / 𝑥]𝜑𝜑) → ∀𝑥𝜑)
2416, 21, 233syl 17 1 (∀𝑦(∀𝑧𝑦 𝜓𝜒) → ∀𝑥𝜑)
Colors of variables: wff set class
Syntax hints:  wi 4  wal 1314  wnf 1421  [wsb 1720  wral 2393  BOUNDED wbd 12937
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099  ax-bdsetind 13093
This theorem depends on definitions:  df-bi 116  df-tru 1319  df-nf 1422  df-sb 1721  df-cleq 2110  df-clel 2113  df-nfc 2247  df-ral 2398
This theorem is referenced by:  bj-inf2vnlem3  13097
  Copyright terms: Public domain W3C validator