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 𝜑

Assertion

Ref	Expression
bdab	⊢ BOUNDED 𝑥 ∈ {𝑦 ∣ 𝜑}

Proof of Theorem bdab

Step	Hyp	Ref	Expression
1		bdab.1	. . 3 ⊢ BOUNDED 𝜑
2	1	ax-bdsb 9942	. 2 ⊢ BOUNDED [𝑥 / 𝑦]𝜑
3		df-clab 2027	. 2 ⊢ (𝑥 ∈ {𝑦 ∣ 𝜑} ↔ [𝑥 / 𝑦]𝜑)
4	2, 3	bd0r 9945	1 ⊢ BOUNDED 𝑥 ∈ {𝑦 ∣ 𝜑}

Syntax hints:   ∈ 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