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Theorem bj-nnfe 34913
Description: Nonfreeness implies the equivalent of ax5e 1915. (Contributed by BJ, 28-Jul-2023.)
Assertion
Ref Expression
bj-nnfe (Ⅎ'𝑥𝜑 → (∃𝑥𝜑𝜑))

Proof of Theorem bj-nnfe
StepHypRef Expression
1 df-bj-nnf 34906 . 2 (Ⅎ'𝑥𝜑 ↔ ((∃𝑥𝜑𝜑) ∧ (𝜑 → ∀𝑥𝜑)))
21simplbi 498 1 (Ⅎ'𝑥𝜑 → (∃𝑥𝜑𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wal 1537  wex 1782  Ⅎ'wnnf 34905
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 206  df-an 397  df-bj-nnf 34906
This theorem is referenced by:  bj-nnfed  34914  bj-nnfei  34915  bj-nnfea  34916  bj-nnfim1  34926  bj-nnfim2  34927  bj-nnf-exlim  34938  bj-19.21t  34951  bj-19.36im  34953  bj-19.42t  34955  bj-sbft  34957
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