Re: [問題] 有人知道這個數學問題的答案嗎
棋盤無限大其實會造成一個結果啦._.a
惡魔先無視天使,蓋兩道垂直的無限長長城
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這個時候天使一定會在四個象限之一,且可以被惡魔定出其座標
所以問題就變成
「給定天使座標(x,y)時,是否有辦法讓天使的兩座標值之一無限上升」
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