From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: git and time Date: Thu, 28 Sep 2006 09:53:56 -0700 (PDT) Message-ID: References: Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: git@vger.kernel.org X-From: git-owner@vger.kernel.org Thu Sep 28 18:54:31 2006 Return-path: Envelope-to: gcvg-git@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by ciao.gmane.org with esmtp (Exim 4.43) id 1GSz9F-00049K-Hn for gcvg-git@gmane.org; Thu, 28 Sep 2006 18:54:10 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751932AbWI1QyD (ORCPT ); Thu, 28 Sep 2006 12:54:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751933AbWI1QyD (ORCPT ); Thu, 28 Sep 2006 12:54:03 -0400 Received: from smtp.osdl.org ([65.172.181.4]:20929 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751932AbWI1QyB (ORCPT ); Thu, 28 Sep 2006 12:54:01 -0400 Received: from shell0.pdx.osdl.net (fw.osdl.org [65.172.181.6]) by smtp.osdl.org (8.12.8/8.12.8) with ESMTP id k8SGrvnW019096 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Thu, 28 Sep 2006 09:53:57 -0700 Received: from localhost (shell0.pdx.osdl.net [10.9.0.31]) by shell0.pdx.osdl.net (8.13.1/8.11.6) with ESMTP id k8SGrueZ014585; Thu, 28 Sep 2006 09:53:56 -0700 To: apodtele In-Reply-To: X-Spam-Status: No, hits=-0.461 required=5 tests=AWL X-Spam-Checker-Version: SpamAssassin 2.63-osdl_revision__1.94__ X-MIMEDefang-Filter: osdl$Revision: 1.154 $ X-Scanned-By: MIMEDefang 2.36 Sender: git-owner@vger.kernel.org Precedence: bulk X-Mailing-List: git@vger.kernel.org Archived-At: On Wed, 27 Sep 2006, apodtele wrote: > > Shall we summarize? Time is a very important concept in physics. Actually, even in physics (or very _much_ in physics), time doesn't follow the nice procession that Matthew is kind of asking for. In physics, particles can go backwards in time or forwards in time (the _likelihood_ that a photon moves at exactly the speed of light is higher, but on a quantum scale, strange things happen). And everybody should by now know what relativity says: time does not impose an "ordering" of events outside of the so-called "cone of light". There is only an ordering imposed by _causality_, not by time. That, btw, is very similar to git. The only _true_ ordering in git is causality. Time itself tends to have certain properties that makes it _look_ like it is about causality, but in real life there is just a strong correlation. Nature is sometimes stranger than our everyday experiences would have us believe. And "time" is a hell of a lot more complicated than just a global one-dimensional entity, steadily ticking away. Linus