From: "Denis Ryabov" Received: by relay1.vsu.ru (CommuniGate Pro PIPE 5.3.12) with PIPE id 295685500; Tue, 15 Feb 2011 14:14:33 +0300 X-drweb-hash: Received: from forward10.mail.yandex.net ([77.88.61.49] verified) by relay1.vsu.ru (CommuniGate Pro SMTP 5.3.12) with ESMTP id 295685491 for cyrtex-ru@vsu.ru; Tue, 15 Feb 2011 14:14:23 +0300 Received-SPF: pass receiver=relay1.vsu.ru; client-ip=77.88.61.49; envelope-from=dryabov@yandex.ru Received: from web92.yandex.ru (web92.yandex.ru [77.88.60.16]) by forward10.mail.yandex.net (Yandex) with ESMTP id AE8623FCA8C1 for ; Tue, 15 Feb 2011 14:14:53 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1297768493; bh=xRtwmbpLg1TIvKJmeCi36MiQBn/7n5VTkHhWovqN5dQ=; h=From:To:In-Reply-To:References:Subject:MIME-Version:Message-Id: Date:Content-Transfer-Encoding:Content-Type; b=YOKkucENNpWLc25WRLaDjGhBEOPHnj/7L2cUtlivI5aWxy/lXeQSKPs1lRBoAs1Sw wPD/fTmExwYzM4BW1r+NkrsreMvfIlbhpISwYdL2U7lz0im2CAEK/YXGO9n8QcFF+Q cVNcRVyKaN8bE1KQEfUzSkIDHv+O/yAI/+vrJbwM= Received: from localhost (localhost.localdomain [127.0.0.1]) by web92.yandex.ru (Yandex) with ESMTP id A3040BF8267 for ; Tue, 15 Feb 2011 14:14:53 +0300 (MSK) Received: from [2.94.20.26] ([2.94.20.26]) by mail.yandex.ru with HTTP; Tue, 15 Feb 2011 14:14:53 +0300 To: Cyrillic TeX Users Group In-Reply-To: References: Subject: =?koi8-r?B?UmU6IO3B1MXNwdTJ3sXTy8nKINvSycbUIMTM0SBUaW1lcw==?= MIME-Version: 1.0 Message-Id: <381671297768493@web92.yandex.ru> Date: Tue, 15 Feb 2011 14:14:53 +0300 X-Mailer: Yamail [ http://yandex.ru ] 5.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=koi8-r X-DrWeb-FlyTrap-Class: NON-SPAM X-DrWeb-FlyTrap-CID: 1 X-DrWeb-FlyTrap-ID: 93443864 15.02.2011, 14:08, "Stanislav Kruchinin" : > а стандартное обозначение для > времени t вообще не надо использовать в качестве индекса. Это обычный способ записи уравнений в частных производных, например $u_t+uu_x+u_{xxx}=0$, в более сложных уравнениях часто возникают конструкции типа $u_{ttxx}$ и т.д. -- С уважением, Денис Рябов