19 lines
494 B
Text
19 lines
494 B
Text
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section
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variables a b c : nat
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variable H1 : a = b
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variable H2 : a + b + a + b = 0
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example : b + b + a + b = 0 :=
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@@eq.rec_on (λ x, x + b + a + b = 0) H1 H2
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end
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section
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variables (f : Π {T : Type₁} {a : T} {P : T → Prop}, P a → Π {b : T} {Q : T → Prop}, Q b → Prop)
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variables (T : Type₁) (a : T) (P : T → Prop) (pa : P a)
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variables (b : T) (Q : T → Prop) (qb : Q b)
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check @f T a P pa b Q qb -- Prop
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check @@f P pa Q qb -- Prop
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check f pa qb -- Prop
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end
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