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Welcome to Abra, a tensor algebra toolkit written in Ruby. Abra is currently a work in progress. The aim is to write a flexible and extendable toolkit to make automated manipulation of tensors an easy task. Algebra involving index contractions, substitutions and other manipulations is a unique challenge, but it lends itself well to an object oriented approach. Hopefully working with the strengths and conventions of Ruby will lead us to create a modern and very useable package.