VISIT apply_info.lean
SYNC 17
import logic
theorem tst1 (a b : Prop) : a → b → a ∧ b :=
begin
 intro Ha,
 intro Hb,
 apply and.intro,
 apply Ha,
 apply Hb,
end

theorem tst2 (a b : Prop) : a → b → a ∧ b :=
assume Ha Hb,
begin
 apply and.intro,
 apply Ha,
 apply Hb,
end
WAIT
INFO 7
INFO 16