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Theorem wnot 128
Description: Negation type.
Assertion
Ref Expression
wnot ¬ :(∗ → ∗)

Proof of Theorem wnot
Dummy variable p is distinct from all other variables.
StepHypRef Expression
1 wim 127 . . . 4 ⇒ :(∗ → (∗ → ∗))
2 wv 58 . . . 4 p:∗:∗
3 wfal 125 . . . 4 ⊥:∗
41, 2, 3wov 64 . . 3 [p:∗ ⇒ ⊥]:∗
54wl 59 . 2 λp:∗ [p:∗ ⇒ ⊥]:(∗ → ∗)
6 df-not 120 . 2 ⊤⊧[¬ = λp:∗ [p:∗ ⇒ ⊥]]
75, 6eqtypri 71 1 ¬ :(∗ → ∗)
Colors of variables: type var term
Syntax hints:  tv 1  ht 2  hb 3  λkl 6  kt 8  [kbr 9  wffMMJ2t 12  tfal 108  ¬ tne 110  tim 111
This theorem was proved from axioms:  ax-cb1 29  ax-refl 39
This theorem depends on definitions:  df-al 116  df-fal 117  df-an 118  df-im 119  df-not 120
This theorem is referenced by:  notval  135  notval2  149  notnot1  150  con3d  152  alnex  174  exnal1  175  exmid  186  notnot  187  exnal  188  ax3  192  ax6  195  ax9  199  ax12  202
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