Theorem tfis2f 4620

Description: Transfinite Induction Schema, using implicit substitution. (Contributed by NM, 18-Aug-1994.)

Hypotheses

Ref	Expression
tfis2f.1	|- F/ x ps
tfis2f.2	|- ( x = y -> ( ph <-> ps ) )
tfis2f.3	|- ( x e. On -> ( A. y e. x ps -> ph ) )

Assertion

Ref	Expression
tfis2f	|- ( x e. On -> ph )

Distinct variable groups:   ph, y   x, y

Allowed substitution hints:   ph( x)   ps( x, y)

Proof of Theorem tfis2f

Step	Hyp	Ref	Expression
1		tfis2f.1	. . . . 5 |- F/ x ps
2		tfis2f.2	. . . . 5 |- ( x = y -> ( ph <-> ps ) )
3	1, 2	sbie 1805	. . . 4 |- ( [ y / x ] ph <-> ps )
4	3	ralbii 2503	. . 3 |- ( A. y e. x [ y / x ] ph <-> A. y e. x ps )
5		tfis2f.3	. . 3 |- ( x e. On -> ( A. y e. x ps -> ph ) )
6	4, 5	biimtrid 152	. 2 |- ( x e. On -> ( A. y e. x [ y / x ] ph -> ph ) )
7	6	tfis 4619	1 |- ( x e. On -> ph )

Syntax hints:   -> wi 4   <-> wb 105   F/wnf 1474   [wsb 1776   e. wcel 2167   A.wral 2475   Oncon0 4398

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 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178  ax-setind 4573

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-rab 2484  df-v 2765  df-in 3163  df-ss 3170  df-uni 3840  df-tr 4132  df-iord 4401  df-on 4403

This theorem is referenced by:  tfis2  4621  tfri3  6425