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Axiom ax-ial 1405
Description: is not free in . Axiom 7 of 10 for intuitionistic logic. (Contributed by Mario Carneiro, 31-Jan-2015.)
Assertion
Ref Expression
ax-ial

Detailed syntax breakdown of Axiom ax-ial
StepHypRef Expression
1 wph . . 3
2 vx . . 3  setvar
31, 2wal 1224 . 2
43, 2wal 1224 . 2
53, 4wi 4 1
Colors of variables: wff set class
This axiom is referenced by:  hba1  1411  ax6b  1519  exdistrfor  1659  sbcof2  1669  hbs1  1792  sbcomxyyz  1824
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