Axiom ax-bdal 13815

Description: A bounded universal quantification of a bounded formula is bounded. Note the disjoint variable condition on 𝑥, 𝑦. (Contributed by BJ, 25-Sep-2019.)

Hypothesis

Ref	Expression
bdal.1	⊢ BOUNDED 𝜑

Assertion

Ref	Expression
ax-bdal	⊢ BOUNDED ∀𝑥 ∈ 𝑦 𝜑

Distinct variable group:   𝑥,𝑦

Allowed substitution hints:   𝜑(𝑥,𝑦)

Detailed syntax breakdown of Axiom ax-bdal

Step	Hyp	Ref	Expression
1		wph	. . 3 wff 𝜑
2		vx	. . 3 setvar 𝑥
3		vy	. . . 4 setvar 𝑦
4	3	cv 1347	. . 3 class 𝑦
5	1, 2, 4	wral 2448	. 2 wff ∀𝑥 ∈ 𝑦 𝜑
6	5	wbd 13809	1 wff BOUNDED ∀𝑥 ∈ 𝑦 𝜑

This axiom is referenced by:  bdreu  13852  bdss  13861  bdcint  13874  bdciin  13876  bdcriota  13880  bj-bdind  13927  bj-nntrans  13948