Theorem bdph 15580

Description: A formula which defines (by class abstraction) a bounded class is bounded. (Contributed by BJ, 6-Oct-2019.)

Hypothesis

Ref	Expression
bdph.1	|- BOUNDED { x | ph }

Assertion

Ref	Expression
bdph	|- BOUNDED ph

Proof of Theorem bdph

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		bdph.1	. . . . 5 |- BOUNDED { x | ph }
2	1	bdeli 15576	. . . 4 |- BOUNDED y e. { x | ph }
3		df-clab 2183	. . . 4 |- ( y e. { x | ph } <-> [ y / x ] ph )
4	2, 3	bd0 15554	. . 3 |- BOUNDED [ y / x ] ph
5	4	ax-bdsb 15552	. 2 |- BOUNDED [ x / y ] [ y / x ] ph
6		sbid2v 2015	. 2 |- ( [ x / y ] [ y / x ] ph <-> ph )
7	5, 6	bd0 15554	1 |- BOUNDED ph

Syntax hints:   [wsb 1776   e. wcel 2167   {cab 2182  BOUNDED wbd 15542  BOUNDED wbdc 15570

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-5 1461  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-11 1520  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-bd0 15543  ax-bdsb 15552

This theorem depends on definitions:  df-bi 117  df-sb 1777  df-clab 2183  df-bdc 15571

This theorem is referenced by:  bds  15581