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Axiom ax-ie1 1291
Description: x is bound in xφ. Axiom 9 of 10 for intuitionistic logic. (Contributed by Mario Carneiro, 31-Jan-2015.)
Assertion
Ref Expression
ax-ie1 (xφxxφ)

Detailed syntax breakdown of Axiom ax-ie1
StepHypRef Expression
1 wph . . 3 wff φ
2 vx . . 3 set x
31, 2wex 1290 . 2 wff xφ
43, 2wal 1251 . 2 wff xxφ
53, 4wi 4 1 wff (xφxxφ)
Colors of variables: wff set class
This axiom is referenced by:  hbe1  1293
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