Theorem axfrege58b 43395

Description: If ∀𝑥𝜑 is affirmed, [𝑦 / 𝑥]𝜑 cannot be denied. Identical to stdpc4 2063. Justification for ax-frege58b 43396. (Contributed by RP, 28-Mar-2020.)

Assertion

Ref	Expression
axfrege58b	⊢ (∀𝑥𝜑 → [𝑦 / 𝑥]𝜑)

Proof of Theorem axfrege58b

Step	Hyp	Ref	Expression
1		stdpc4 2063	1 ⊢ (∀𝑥𝜑 → [𝑦 / 𝑥]𝜑)

Syntax hints:   → wi 4  ∀wal 1531  [wsb 2059

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905

This theorem depends on definitions:  df-bi 206  df-sb 2060

This theorem is referenced by: (None)