7 lines
173 B
Text
7 lines
173 B
Text
import logic
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exit -- TODO
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theorem tst (a b : Bool) (H : a ↔ b) : b ↔ a
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:= by (apply iff_intro,
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assume Hb, iff_mp_right H Hb,
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assume Ha, iff_mp_left H Ha)
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