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Axiom ax-bdex 10895
Description: A bounded existential quantification of a bounded formula is bounded. Note the DV condition on 𝑥, 𝑦. (Contributed by BJ, 25-Sep-2019.)
Hypothesis
Ref Expression
bdal.1 BOUNDED 𝜑
Assertion
Ref Expression
ax-bdex BOUNDED𝑥𝑦 𝜑
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)

Detailed syntax breakdown of Axiom ax-bdex
StepHypRef Expression
1 wph . . 3 wff 𝜑
2 vx . . 3 setvar 𝑥
3 vy . . . 4 setvar 𝑦
43cv 1284 . . 3 class 𝑦
51, 2, 4wrex 2354 . 2 wff 𝑥𝑦 𝜑
65wbd 10888 1 wff BOUNDED𝑥𝑦 𝜑
Colors of variables: wff set class
This axiom is referenced by:  bj-bdcel  10913  bdreu  10931  bdrmo  10932  bdcuni  10952  bdciun  10954  bj-axun2  10991  bj-nn0suc0  11030
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