Theorem sbcimg 3087

Description: Distribution of class substitution over implication. (Contributed by NM, 16-Jan-2004.)

Assertion

Ref	Expression
sbcimg	|- (A e. V -> ( [.A / x ].(ph -> ps) <-> ( [.A / x ].ph -> [.A / x ].ps)))

Proof of Theorem sbcimg

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfsbcq2 3049	. 2 |- (y = A -> ([y / x](ph -> ps) <-> [.A / x ].(ph -> ps)))
2		dfsbcq2 3049	. . 3 |- (y = A -> ([y / x]ph <-> [.A / x ].ph))
3		dfsbcq2 3049	. . 3 |- (y = A -> ([y / x]ps <-> [.A / x ].ps))
4	2, 3	imbi12d 311	. 2 |- (y = A -> (([y / x]ph -> [y / x]ps) <-> ( [.A / x ].ph -> [.A / x ].ps)))
5		sbim 2065	. 2 |- ([y / x](ph -> ps) <-> ([y / x]ph -> [y / x]ps))
6	1, 4, 5	vtoclbg 2915	1 |- (A e. V -> ( [.A / x ].(ph -> ps) <-> ( [.A / x ].ph -> [.A / x ].ps)))

Syntax hints:   -> wi 4   <-> wb 176   = wceq 1642  [wsb 1648   e. wcel 1710   [.wsbc 3046

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-sbc 3047

This theorem is referenced by:  sbceqal  3097  sbcimdv  3107  sbc19.21g  3110  sbcss  3660  iota4an  4358