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我完成了一个有点冗长的证明,但每当我尝试时,Qed我都会收到错误消息Error: This proof is focused, but cannot be unfocused this way。有没有其他方法可以使证明失去焦点?即使我的证明是严格的,我应该只使用承认吗?作为参考,我使用的是 CoqIDE 8.6