Theorem spsbc 3058

Description: Specialization: if a formula is true for all sets, it is true for any class which is a set. Similar to Theorem 6.11 of [Quine] p. 44. See also stdpc4 2024 and rspsbc 3124. (Contributed by NM, 16-Jan-2004.)

Assertion

Ref	Expression
spsbc	|- (A e. V -> (A.xph -> [.A / x ].ph))

Proof of Theorem spsbc

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		stdpc4 2024	. . . 4 |- (A.xph -> [y / x]ph)
2		sbsbc 3050	. . . 4 |- ([y / x]ph <-> [.y / x ].ph)
3	1, 2	sylib 188	. . 3 |- (A.xph -> [.y / x ].ph)
4		dfsbcq 3048	. . 3 |- (y = A -> ( [.y / x ].ph <-> [.A / x ].ph))
5	3, 4	syl5ib 210	. 2 |- (y = A -> (A.xph -> [.A / x ].ph))
6	5	vtocleg 2925	1 |- (A e. V -> (A.xph -> [.A / x ].ph))

Syntax hints:   -> wi 4  A.wal 1540   = 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-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-v 2861  df-sbc 3047

This theorem is referenced by:  spsbcd  3059  sbcth  3060  sbcthdv  3061  sbceqal  3097  sbcimdv  3107  csbexg  3146  csbiebt  3172