Theorem bdnel 9974

Description: Non-membership of a setvar in a bounded formula is a bounded formula. (Contributed by BJ, 16-Oct-2019.)

Hypothesis

Ref	Expression
bdnel.1	|- BOUNDED A

Assertion

Ref	Expression
bdnel	|- BOUNDED x e/ A

Distinct variable group:   x, A

Proof of Theorem bdnel

Step	Hyp	Ref	Expression
1		bdnel.1	. . . 4 |- BOUNDED A
2	1	bdeli 9966	. . 3 |- BOUNDED x e. A
3	2	ax-bdn 9937	. 2 |- BOUNDED -. x e. A
4		df-nel 2207	. 2 |- ( x e/ A <-> -. x e. A )
5	3, 4	bd0r 9945	1 |- BOUNDED x e/ A

Syntax hints:   -. wn 3   e. wcel 1393   e/ wnel 2205  BOUNDED wbd 9932  BOUNDED wbdc 9960

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-4 1400  ax-bd0 9933  ax-bdn 9937

This theorem depends on definitions:  df-bi 110  df-nel 2207  df-bdc 9961

This theorem is referenced by: (None)