From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: How to make M-x TAB not work on (interactive) declaration? Date: Tue, 17 Jan 2023 12:52:06 +0100 Message-ID: <874jspidjt.fsf@web.de> References: <87y1qdct5m.fsf@gnu.org> <874jt0imh0.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33080"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:VM7JKAvMtUAtqQk1yXjjUndIZb0= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 17 12:52:43 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 1pHkWA-0008Nh-BQ for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 17 Jan 2023 12:52:42 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pHkVn-0007Lx-AA; Tue, 17 Jan 2023 06:52:19 -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 1pHkVm-0007Ln-5K for help-gnu-emacs@gnu.org; Tue, 17 Jan 2023 06:52:18 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pHkVk-0007Su-Nr for help-gnu-emacs@gnu.org; Tue, 17 Jan 2023 06:52:17 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pHkVg-0007m0-Vt for help-gnu-emacs@gnu.org; Tue, 17 Jan 2023 12:52:12 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:142300 Archived-At: Drew Adams writes: > Yes, it's taking a shortcut, supposing that you > think of a "product" of one arg and a "product" > of zero args: (* N) -> N, (*) -> 0 > > But it's fairly common, for programmers at least, > to consider a "product" function as accepting any > number of arguments (or accepting a single list > of any number of elements). n^0 = 1. n^0 can be interpreted as an empty product of factors n. n*0 = 0. n*0 can be interpreted as an empty sum of summands n. That's all trivial stuff and used all the time - nobody would ever say that (* 3 0) ==> 0 is wrong or want to document this case specially. (+) and (*) are not very different, just a bit less often used in practice. Michael.