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Axiom ax-ial 1359
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
31, 2wal 1266 . 2
43, 2wal 1266 . 2
53, 4wi 4 1
Colors of variables: wff set class
This axiom is referenced by:  hba1  1365  ax6b  1447  exdistrf  1567  sbcof2  1577  hbs1  1690  sbcomxyyz  1723  sbalyz  1752
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