论文标题
康威的噩梦：婆罗门和蝴蝶
Conway's Nightmare: Brahmagupta and Butterflies
论文作者
论文摘要
该注释给出了Brahmagupta的循环四边形公式的非常简洁的概念证明，然后进行了长时间的讨论，讨论了如何受到现代数学思想的启发。
This note gives a very succinct conceptual proof of Brahmagupta's formula for cyclic quadrilaterals, and then a long discussion about how the proof is inspired by ideas from modern mathematics.
