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Theorem ax4 140
Description: If A is true for all x:α, then it is true for A.
Hypothesis
Ref Expression
ax4.1 A:∗
Assertion
Ref Expression
ax4 (λx:α A)⊧A

Proof of Theorem ax4
StepHypRef Expression
1 ax4.1 . . . 4 A:∗
21wl 59 . . 3 λx:α A:(α → ∗)
3 wv 58 . . 3 x:α:α
42, 3ax4g 139 . 2 (λx:α A)⊧(λx:α Ax:α)
54ax-cb1 29 . . 3 (λx:α A):∗
61beta 82 . . 3 ⊤⊧[(λx:α Ax:α) = A]
75, 6a1i 28 . 2 (λx:α A)⊧[(λx:α Ax:α) = A]
84, 7mpbi 72 1 (λx:α A)⊧A
Colors of variables: type var term
Syntax hints:  tv 1  hb 3  kc 5  λkl 6   = ke 7  [kbr 9  wffMMJ2 11  wffMMJ2t 12  tal 112
This theorem was proved from axioms:  ax-syl 15  ax-jca 17  ax-simpl 20  ax-simpr 21  ax-id 24  ax-trud 26  ax-cb1 29  ax-cb2 30  ax-refl 39  ax-eqmp 42  ax-ded 43  ax-ceq 46  ax-beta 60  ax-distrc 61  ax-leq 62  ax-hbl1 93  ax-17 95  ax-inst 103
This theorem depends on definitions:  df-ov 65  df-al 116
This theorem is referenced by:  alimdv  172  alnex  174  ax5  194  ax7  196  ax10  200  axext  206
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