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<blockquote><a href="http://quotationsbook.com/quote/38731/">The Theory of Groups is a branch of mathematics in which one does something to something and then compares the result with the result obtained from doing the same thing to something else, or something else to the same thing.</a></blockquote><br> <a href="http://quotationsbook.com/quotes/author/5316/">Newman, James</a> on <a href="http://quotationsbook.com/quotes/tag/theory/">theory</a><br> Quote from <a href="http://quotationsbook.com">Quotations Book</a>