From haskell-jp=return@quickml.com Wed Jun 15 17:48:54 2005 Received: from kankan.nagaokaut.ac.jp (kankan.nagaokaut.ac.jp [133.44.2.24]) by blade.nagaokaut.ac.jp (8.12.3/8.12.3/Debian-6.6) with ESMTP id j5F8msgZ030312; Wed, 15 Jun 2005 17:48:54 +0900 Received: from funfun.nagaokaut.ac.jp (funfun.nagaokaut.ac.jp [133.44.2.201]) by kankan.nagaokaut.ac.jp (Postfix) with ESMTP id 5FF985998; Wed, 15 Jun 2005 17:48:55 +0900 (JST) Received: from localhost (localhost.nagaokaut.ac.jp [127.0.0.1]) by funfun.nagaokaut.ac.jp (Postfix) with ESMTP id E2AC6F0489C; Wed, 15 Jun 2005 17:48:57 +0900 (JST) Received: from voscc.nagaokaut.ac.jp (voscc.nagaokaut.ac.jp [133.44.1.100]) by funfun.nagaokaut.ac.jp (Postfix) with ESMTP id AC027F0489B; Wed, 15 Jun 2005 17:48:56 +0900 (JST) Received: from master.quickml.com (219-106-226-205.cust.bit-drive.ne.jp [219.106.226.205]) by voscc.nagaokaut.ac.jp (Postfix) with ESMTP id 9F553630086; Wed, 15 Jun 2005 17:48:55 +0900 (JST) Received: from master.quickml.com (localhost [127.0.0.1]) by master.quickml.com (Postfix) with ESMTP id 554DA1F3154; Wed, 15 Jun 2005 17:48:55 +0900 (JST) Received: from master.quickml.com (localhost [127.0.0.1]) by localhost (QuickML) with ESMTP; Wed, 15 Jun 2005 17:48:55 +0900 Received: from dokuro.isac.co.jp (dokuro.isac.co.jp [202.32.143.130]) by master.quickml.com (Postfix) with ESMTP id 11C8A1F3154 for ; Wed, 15 Jun 2005 17:48:55 +0900 (JST) Received: from mailgw1.psrc.isac.co.jp (mailgw1.psrc.isac.co.jp [202.32.143.142]) by dokuro.isac.co.jp (8.9.3/3.7W) with ESMTP id RAA02982; Wed, 15 Jun 2005 17:48:49 +0900 (JST) Received: from snark.tech.isac.co.jp (snark.tech.isac.co.jp [192.47.124.4]) by mailgw1.psrc.isac.co.jp (8.12.8/3.6W) with ESMTP id j5F8mmio014897; Wed, 15 Jun 2005 17:48:49 +0900 (JST) Received: from [192.47.125.48] (unknown [192.47.125.48]) by snark.tech.isac.co.jp (Postfix) with ESMTP id 2D0A6143DA; Wed, 15 Jun 2005 17:48:48 +0900 (JST) Date: Wed, 15 Jun 2005 17:48:36 +0900 From: TOYOFUKU Chikanobu To: haskell-jp@quickml.com In-Reply-To: <200506091611.j59GB50N005688@mail530.nifty.com> References: <20050607.130858.80452092.nobsun@sampou.org> <200506091611.j59GB50N005688@mail530.nifty.com> Message-Id: <20050615174809.FF7E.NOBU_TOYOFUKU@nifty.com> MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.21.03 [ja] Subject: [haskell-jp:664] Re: =?iso-2022-jp?B?GyRCTFokR003JFYbKEI=?= Reply-To: haskell-jp@quickml.com X-Mail-Count: 664 Precedence: bulk X-ML-Address: haskell-jp@quickml.com X-ML-Name: haskell-jp X-ML-Info: http://QuickML.com/ X-QuickML: true X-Virus-Scanned: by AMaViS snapshot-20020531 豊福です。 余談ですが、 > -- n個の要素からできる二分木の数は (2n-2)!/(n!(n-1)!) 個 これの組合せ論的求め方がないかと調べていてわかったのですが このような数はカタラン数と呼ばれオイラーの時代から調べられて いるようです。 「カタラン数」で検索すれば解説がいっぱい見つかりますので私から これ以上は語ら（略） --- 豊福 nobu_toyofuku@nifty.com -- ML: haskell-jp@quickml.com 使い方: http://QuickML.com/