5 lines
177 B
Text
5 lines
177 B
Text
import logic
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open tactic
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theorem T (a b c d : Prop) (Ha : a) (Hb : b) (Hc : c) (Hd : d) : a ∧ b ∧ c ∧ d
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:= by fixpoint (λ f, [apply @and.intro; f | assumption; f | id])
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