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Theorem sbh 2539
Description: Substitution for a variable not free in a wff does not affect it. (Contributed by NM, 14-May-1993.)
Hypothesis
Ref Expression
sbh.1 (𝜑 → ∀𝑥𝜑)
Assertion
Ref Expression
sbh ([𝑦 / 𝑥]𝜑𝜑)

Proof of Theorem sbh
StepHypRef Expression
1 sbh.1 . . 3 (𝜑 → ∀𝑥𝜑)
21nf5i 2189 . 2 𝑥𝜑
32sbf 2538 1 ([𝑦 / 𝑥]𝜑𝜑)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 197  wal 1635  [wsb 2059
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1877  ax-4 1894  ax-5 2001  ax-6 2067  ax-7 2103  ax-10 2184  ax-12 2213  ax-13 2419
This theorem depends on definitions:  df-bi 198  df-an 385  df-ex 1860  df-nf 1864  df-sb 2060
This theorem is referenced by: (None)
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