Entry Value
Name ETA_AX
Conclusion !t. (\x. t x) = t
Constructive Proof Yes
Axiom 
(\a. a = (\b. (\c. c) = (\c. c))) (\d. (\e. d e) = d)
Classical Lemmas N|A
Constructive Lemmas
  • T <=> (\p. p) = (\p. p)
  • (!) = (\p. p = (\x. T))
    		•
    Contained Package axiom-extensionality
    Comment Standard HOL library retrieved from OpenTheory
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