An old theorem from the first half of the nineteenth century by lowry , wallace , bolyai and gerwien asserts that any simple polygon can be dissected into a finite number of pieces and put back together to form any other simple polygon of the same area 十九世纪上半叶lowry ， wallace ， bolyai与gerwien同时证明了一个古老的数学命题：任意给定平面上一个简单多边形，必可将其分划成有限块，重新安排，拼成另一个任意给定的等面积的简单多边形。
