終幸問題
終幸問題（英言Happy ending problem），保羅·艾狄胥名之，數學問題。是題有定理，曰：平面有五點，必有四點能成凸四邊形。
亦有廣義定理云：有一正整數，存有正整數以使予平面以點，必有點能成凸邊形。
使為之最小可能值，則知
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