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Theorem ax11w 2009
 Description: Weak version of ax-11 2036 from which we can prove any ax-11 2036 instance not involving wff variables or bundling. Uses only Tarski's FOL axiom schemes. Unlike ax-11 2036, this theorem requires that 𝑥 and 𝑦 be distinct i.e. are not bundled. (Contributed by NM, 10-Apr-2017.)
Hypothesis
Ref Expression
ax11w.1 (𝑦 = 𝑧 → (𝜑𝜓))
Assertion
Ref Expression
ax11w (∀𝑥𝑦𝜑 → ∀𝑦𝑥𝜑)
Distinct variable groups:   𝑦,𝑧   𝑥,𝑦   𝜑,𝑧   𝜓,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑥,𝑧)

Proof of Theorem ax11w
StepHypRef Expression
1 ax11w.1 . 2 (𝑦 = 𝑧 → (𝜑𝜓))
21alcomiw 1973 1 (∀𝑥𝑦𝜑 → ∀𝑦𝑥𝜑)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196  ∀wal 1478 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937 This theorem depends on definitions:  df-bi 197  df-an 386  df-ex 1702 This theorem is referenced by: (None)
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