Theorem bdab 9958

Description: Membership in a class defined by class abstraction using a bounded formula, is a bounded formula. (Contributed by BJ, 3-Oct-2019.)

Hypothesis

Ref	Expression
bdab.1	|- BOUNDED ph

Assertion

Ref	Expression
bdab	|- BOUNDED x e. { y | ph }

Proof of Theorem bdab

Step	Hyp	Ref	Expression
1		bdab.1	. . 3 |- BOUNDED ph
2	1	ax-bdsb 9942	. 2 |- BOUNDED [ x / y ] ph
3		df-clab 2027	. 2 |- ( x e. { y | ph } <-> [ x / y ] ph )
4	2, 3	bd0r 9945	1 |- BOUNDED x e. { y | ph }

Syntax hints:   e. wcel 1393   [wsb 1645   {cab 2026  BOUNDED wbd 9932

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-bd0 9933  ax-bdsb 9942

This theorem depends on definitions:  df-bi 110  df-clab 2027

This theorem is referenced by:  bdcab  9969  bdsbcALT  9979