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如何使用形状假设
H : exists x, P x
在战术模式?在术语模式下,我会使用
obtain x Hx, from H,
它的语法完全相同:
example (A : Type) (p : A × A) : A := begin obtain x y, from p, x end
begin...end您当然可以使用after重新进入战术模式from。
begin...end
from