Web后来，由印度天才数学家拉马努金给出过一个简化的证明。. 这个定理说的是，在任意的正整数 n 到 2n 之间（指大于 n 小于等于 2n ），至少存在一个素数。. 比如我们随便找一个 … WebJan 27, 2015 · These numbers are called Catalan numbers, and other proofs come from showing that they count discrete objects like the number of different (consistent) ways to insert pairs of brackets in an algebraic expression containing n symbols [eg a (bc); (ab)c for three symbols]. ( 2 n)! = ( 2 n) ( 2 n − 1) ( 2 m − 2) ⋯ 3 ⋅ 2 ⋅ 1.
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(2n-1)!!/(2n)!!=?【高等数学吧】_百度贴吧
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