From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: How to make M-x TAB not work on (interactive) declaration? Date: Tue, 17 Jan 2023 19:42:47 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1718"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) Cc: Drew Adams , Rudolf =?utf-8?Q?Adamkovi=C4=8D?= , "help-gnu-emacs@gnu.org" To: Yuri Khan Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 17 18:20:41 2023 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pHpdZ-0000JX-Mt for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 17 Jan 2023 18:20:41 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHpdM-0006pK-M8; Tue, 17 Jan 2023 12:20:28 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHpdH-0006nx-RG for help-gnu-emacs@gnu.org; Tue, 17 Jan 2023 12:20:26 -0500 Original-Received: from stw1.rcdrun.com ([217.170.207.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHpdG-0006E8-29 for help-gnu-emacs@gnu.org; Tue, 17 Jan 2023 12:20:23 -0500 Original-Received: from localhost ([::ffff:102.85.233.9]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000056164.0000000063C6D8D7.000025AC; Tue, 17 Jan 2023 10:20:22 -0700 Mail-Followup-To: Yuri Khan , Drew Adams , Rudolf =?utf-8?Q?Adamkovi=C4=8D?= , "help-gnu-emacs@gnu.org" Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142321 Archived-At: Thanks, I could follow the previous. * Yuri Khan [2023-01-17 19:00]: > School had also said multiplying by 1 has the same effect as not > multiplying at all. Not in absence of factors! > That is, a * 1 = a. Also, school had said that for every non-zero a, > if a * b = a * c, then b = c, hadn’t it? Somewhere around the time > you learned to solve equations. It was called canceling. I can see how you try to make it logic, but I do not ask for mathematics out of context of Lisp. I am asking why is in Lisp so? Common Lisp, Emacs Lisp, Guile, Newlisp, elk, with difference that Emacs Lisp (-) ➜ 0 but in others arguments missing, with Picolisp where (-) ➜ nil, (*) ➜ nil, (+) ➜ nil, but `apply' works. Why would Emacs Lisp have (-) ➜ 0 and other Lisps not? If `apply' works in Picolisp without problem, is the usage of such functions really the reason for yielding identity for (*), (+), (-)? > Let’s look at that a * 1 = a. On the left, we have the product of two > numbers. On the right, we have one number, and if we squint at it like > this, we can say it’s a product of one number. So these are two > products that have a common element. We can cancel it. (Assuming it’s > not zero. But we know that a * 1 = a holds for any a, including > non-zeros.) > > Now, on the left, we have 1. On the right… we have a product of no > numbers. And there is an equality sign in between. I have followed your guidance, but your guidance speaks of existence of something to cancel, and I speak of absence of arguments! Not even identity theory does not speak of identity elements in absence of everyting else! -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/