From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 456 invoked from network); 16 Feb 2022 00:59:34 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 16 Feb 2022 00:59:34 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 38DC29D048; Wed, 16 Feb 2022 10:59:31 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 3672C9D035; Wed, 16 Feb 2022 10:59:00 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="key not found in DNS" (0-bit key; unprotected) header.d=humeweb.com header.i=@humeweb.com header.b="BL5swxiG"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 557D79D426; Wed, 16 Feb 2022 10:57:53 +1000 (AEST) X-Greylist: delayed 1359 seconds by postgrey-1.36 at minnie.tuhs.org; Wed, 16 Feb 2022 10:57:51 AEST Received: from gateway11.unifiedlayer.com (gateway11.unifiedlayer.com [70.40.201.94]) by minnie.tuhs.org (Postfix) with ESMTPS id 62B689D0BE for ; Wed, 16 Feb 2022 10:57:51 +1000 (AEST) Received: from cm6.websitewelcome.com (unknown [108.167.139.19]) by gateway11.unifiedlayer.com (Postfix) with ESMTP id 14E4E200A008E for ; Tue, 15 Feb 2022 18:35:12 -0600 (CST) Received: from dallas136.arvixeshared.com ([23.91.70.4]) by cmsmtp with ESMTP id K8HnnoaAutGNQK8HonPNW0; Tue, 15 Feb 2022 18:35:12 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=humeweb.com ; s=default; h=To:References:Message-Id:Content-Transfer-Encoding:Cc:Date: In-Reply-To:From:Subject:Mime-Version:Content-Type:Sender:Reply-To:Content-ID :Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To: Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe :List-Post:List-Owner:List-Archive; bh=vR7hy9zU1k1+pYIQYpQeaweGpY3v1wnr5wjTjVDexkc=; b=BL5swxiGiCBSzvFaBn/f1d3+lG 7kh6ruLZZZqsX1xQ4jFeO7QjsJ/7/MW21bBJbPw5rpTRGfdTga0srBG+aCuhGRzsXso0Eb/7EnIit NTX4QLSCT1gHgHYB+qLOfjkqH3zZCuK6s/hwruyfmpPAjGjBqpzisuZAD6wME1iBF9+I=; Received: from 99-98-248-85.lightspeed.irvnca.sbcglobal.net ([99.98.248.85]:59381 helo=smtpclient.apple) by dallas136.arvixeshared.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nK8Hn-003wZS-Pu; Tue, 15 Feb 2022 18:35:11 -0600 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.40.0.1.81\)) From: Andrew Hume In-Reply-To: Date: Tue, 15 Feb 2022 16:35:09 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: <8249A4E0-92D7-4B87-83F2-45724F10F7A5@humeweb.com> References: To: Douglas McIlroy X-Mailer: Apple Mail (2.3693.40.0.1.81) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - dallas136.arvixeshared.com X-AntiAbuse: Original Domain - minnie.tuhs.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - humeweb.com X-BWhitelist: no X-Source-IP: 99.98.248.85 X-Source-L: No X-Exim-ID: 1nK8Hn-003wZS-Pu X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 99-98-248-85.lightspeed.irvnca.sbcglobal.net (smtpclient.apple) [99.98.248.85]:59381 X-Source-Auth: andrew@humeweb.com X-Email-Count: 1 X-Source-Cap: YWh1bWU7YWh1bWU7ZGFsbGFzMTM2LmFydml4ZXNoYXJlZC5jb20= X-Local-Domain: yes Subject: Re: [TUHS] Lorinda Cherry X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" for many years, my office was diagonally opposite lorinda=E2=80=99s. we worked together most closely on the Unix manuals (ninth and tenth editions); lorinda spent considerable work on the permuted indices and the papers on Volume 2. she also shared in my my own weird story of synchronicity. i had been doing some work on polyhedra composed of regular polyhedra. to prove to myself that i had gotten things correct, i constructed a folding program to form the polyhedra by folding a flat network of faces. i did this in bc and verified that the vertices were sufficiently close together. and indeed, as i = increased the precision, the points coincided. except one didn=E2=80=99t. for one polyhedra, one vertex stubbornly never got closer than about 1e-6 from its (supposedly) coincident alter points. it took about 3-4 days before i found the problem; in some exceptionally rare cases, division in bc yielded the wrong answer. i race around to lorinda to show her the problem (it was in the = underlying dc code). to my astonishment, lorinda listened and said =E2=80=9Cyou know, not 30 minutes ago, Vic Vyssotsky (our executive = director) came in with exactly the same problem.=E2=80=9D he had discovered it by = using an extremely long-winded cyclical calculation used to detect errors in arithmetic units. she then discovered the bug occurred when she = converted the original assembler code into C. the weird part was that this bug had been latent for some years, and two different people reported it to her with 30 minutes.