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Theorem pm11.59 39117
Description: Theorem *11.59 in [WhiteheadRussell] p. 165. (Contributed by Andrew Salmon, 25-May-2011.)
Assertion
Ref Expression
pm11.59 (∀𝑥(𝜑𝜓) → ∀𝑦𝑥((𝜑 ∧ [𝑦 / 𝑥]𝜑) → (𝜓 ∧ [𝑦 / 𝑥]𝜓)))
Distinct variable groups:   𝜑,𝑦   𝜓,𝑦
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)

Proof of Theorem pm11.59
StepHypRef Expression
1 nfv 1995 . . 3 𝑦(𝜑𝜓)
21nfal 2317 . 2 𝑦𝑥(𝜑𝜓)
3 sp 2207 . . . 4 (∀𝑥(𝜑𝜓) → (𝜑𝜓))
4 spsbim 2541 . . . 4 (∀𝑥(𝜑𝜓) → ([𝑦 / 𝑥]𝜑 → [𝑦 / 𝑥]𝜓))
53, 4anim12d 596 . . 3 (∀𝑥(𝜑𝜓) → ((𝜑 ∧ [𝑦 / 𝑥]𝜑) → (𝜓 ∧ [𝑦 / 𝑥]𝜓)))
65axc4i 2295 . 2 (∀𝑥(𝜑𝜓) → ∀𝑥((𝜑 ∧ [𝑦 / 𝑥]𝜑) → (𝜓 ∧ [𝑦 / 𝑥]𝜓)))
72, 6alrimi 2238 1 (∀𝑥(𝜑𝜓) → ∀𝑦𝑥((𝜑 ∧ [𝑦 / 𝑥]𝜑) → (𝜓 ∧ [𝑦 / 𝑥]𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382  wal 1629  [wsb 2049
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 835  df-ex 1853  df-nf 1858  df-sb 2050
This theorem is referenced by: (None)
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