Amazon Bookstore Cooperative Amazon Bookstore Cooperative Amazon Bookstore Cooperative was a feminist bookstore located in Minneapolis, Minnesota, that operated from 1970 to 2012. It was the first lesbian/feminist bookstore in the U.S. The shop was named after the Amazons, a mythological tribe of fierce and independent women. After decades in business, it sold its name to Amazon.com. In 1970 when Amazon was founded by Rosina Richter Christy and Julie Morse Quist, it was far from a full-fledged bookstore. The books were kept in the front room of the women's collective they lived in and books were only available from 3 to 6 PM
Cadabra (computer program) Cadabra (computer program) Cadabra is a computer algebra system designed specifically for the solution of problems encountered in quantum field theory and string theory. The first version of Cadabra has been developped around 2001 to for computing higher-derivative string theory correction to supergravity. Released under the GNU General Public License, Cadabra is free software. Cadabra has extensive functionality for tensor polynomial simplification including multi-term symmetries, fermions and anti-commuting variables, Clifford algebras and Fierz transformations, implicit coordinate dependence, multiple index types and many more. The input format is a subset of TeX. Both a command-line and a graphical interface are available.