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: Sun, 15 Jan 2023 23:57:29 +0300 Message-ID: References: <61c2cc81db661e2624771a06a1274eac.support1@rcdrun.com> <87y1qdct5m.fsf@gnu.org> <874jt0imh0.fsf@dataswamp.org> 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="26378"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) Cc: help-gnu-emacs@gnu.org To: Rudolf =?utf-8?Q?Adamkovi=C4=8D?= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jan 15 22:05:38 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 1pHAC9-0006St-Sp for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 15 Jan 2023 22:05:37 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHABR-0006pP-Lf; Sun, 15 Jan 2023 16:04:53 -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 1pHABP-0006pB-5H for help-gnu-emacs@gnu.org; Sun, 15 Jan 2023 16:04:51 -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 1pHABJ-00073a-K6 for help-gnu-emacs@gnu.org; Sun, 15 Jan 2023 16:04:50 -0500 Original-Received: from localhost ([::ffff:197.239.8.177]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000055D73.0000000063C46A6B.00002DE5; Sun, 15 Jan 2023 14:04:42 -0700 Mail-Followup-To: 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:142256 Archived-At: * Rudolf Adamkovič [2023-01-15 23:19]: > Jean Louis writes: > > >> (+) ➜ 0 > > > > Why? It is wrong. > > In Lisp, the `+' operator returns the sum of the additive identity with all of > its arguments. The additive identity equals zero and you provided zero > arguments. Hence, you get the additive identity. It is interesting and I understand that it does, not that I agree that it is correct. It is computer specific, not mathematics. Nothing is not zero mathematically, so if I don't add any arguments, there shall be no result that it is zero. Difference Between Zero and Nothing | Compare the Difference Between Similar Terms: https://www.differencebetween.com/difference-between-zero-and-vs-nothing/ What’s the difference between Zero and Nothing? • ‘Zero’ is a number while ‘nothing’ is a concept. • ‘Zero’ has numerical position value, while ‘nothing’ is not. • ‘Zero’ has its own properties in arithmetic, while nothing has any such properties. When we see function `+' Return sum of any number of arguments, which are numbers or markers. Thus sum of any number of no arguments cannot be zero, because there were no arguments. > >> (*) ➜ 1 > > > > Why? It is wrong. > > In Lisp, the `*' operator returns the product of the multiplicative identity and > all of its arguments. The multiplicative identity equals one and you provided > zero arguments. Hence, you get the multiplicative identity. Description says: (* &rest NUMBERS-OR-MARKERS) Return product of any number of arguments, which are numbers or markers. Product of no arguments cannot be possibly zero, so the function is mathematically and by description incorrect. I do understand that there is some LISP mystery why is it so. If nothing would be equal to zero then following would be equal: (* 0 0 ) ➜ 0 (*) ➜ 1 but they are not. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/