From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Appending lists Date: Fri, 18 Jun 2021 22:35:17 -0400 Message-ID: References: <87o8c8l32h.fsf@posteo.net> <87zgvs2bup.fsf@zoho.eu> <87y2bby1kr.fsf@zoho.eu> <20210615091834.GB24886@tuxteam.de> <87im2ewr3k.fsf@zoho.eu> <20210616072819.GB17919@tuxteam.de> <20210616151101.GB5669@tuxteam.de> <875yydtnqz.fsf@zoho.eu> <20210617075013.GE16310@tuxteam.de> <87v96a3fcs.fsf@zoho.eu> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9591"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:E6t2IEdlWs5056yI+MpUQ3M0PHo= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Jun 19 04:35:50 2021 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 1luQpq-0002Om-Ft for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 19 Jun 2021 04:35:50 +0200 Original-Received: from localhost ([::1]:46722 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1luQpp-0002Vw-Bu for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Jun 2021 22:35:49 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56608) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1luQpR-0002Ux-Pf for help-gnu-emacs@gnu.org; Fri, 18 Jun 2021 22:35:25 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:60256) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1luQpQ-0005Ft-4m for help-gnu-emacs@gnu.org; Fri, 18 Jun 2021 22:35:25 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1luQpO-0001qW-Au for help-gnu-emacs@gnu.org; Sat, 19 Jun 2021 04:35:22 +0200 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, 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: 2.1.23 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" Xref: news.gmane.io gmane.emacs.help:131006 Archived-At: > The example that I found > > A definition is said to be impredicative if it generalizes > over a totality to which the entity being defined belongs. > [...] A person x is general-like if and only if, for every > property P which all great generals have, x too has P. [2] > > is also what I would call recursion. Notice that the above defines `general-like` but the definition does not mention `general-like`. So it is not the usual kind of recursion like the definition of factorial which refers to factorial. The circularity in the example above comes from the fact that `general-like` is a property, so `P` can also be the property `general-like`. Stefan