Theorem bdsbcALT 15008

Description: Alternate proof of bdsbc 15007. (Contributed by BJ, 16-Oct-2019.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
bdcsbc.1	|- BOUNDED ph

Assertion

Ref	Expression
bdsbcALT	|- BOUNDED [. y / x ]. ph

Proof of Theorem bdsbcALT

Step	Hyp	Ref	Expression
1		bdcsbc.1	. . 3 |- BOUNDED ph
2	1	bdab 14987	. 2 |- BOUNDED y e. { x | ph }
3		df-sbc 2978	. 2 |- ( [. y / x ]. ph <-> y e. { x | ph } )
4	2, 3	bd0r 14974	1 |- BOUNDED [. y / x ]. ph

Syntax hints:   e. wcel 2160   {cab 2175   [.wsbc 2977  BOUNDED wbd 14961

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-bd0 14962  ax-bdsb 14971

This theorem depends on definitions:  df-bi 117  df-clab 2176  df-sbc 2978

This theorem is referenced by: (None)