The if-else cases in lsqr.py were not exhaustive. They become exhaustive by changing ab > aa to ab >= aa.
From: Dmitriy Morozov <morozov@cs.duke.edu>
Date: Wed, 06 Feb 2008 16:45:13 -0500
State: new
Subject: About section in README
Message-Id: <e6d9deee8fbd81a5-0-artemis@metatron>
Add "About" section to the README file.