Linear Algebra What Are the Best Beginner Resources for Understanding Groups and Symmetry?

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A user seeks recommendations for introductory resources on groups and symmetry, specifically mentioning interest in general, orthogonal, and unitary groups. Another participant suggests "Groups and Symmetry" by Armstrong as a suitable book. They also mention the availability of used copies on Amazon for under $15, highlighting the affordability of books as a worthwhile investment for learning.
Kevin McHugh
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Hi folks,

I know nothing about groups or symmetry. Could anyone recommend a good introduction that defines groups and explains their notation and operations? I am particularly interested in general, orthogonal, and unitary groups.

Thanks in advance. Kevin
 
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I would recommend "Groups and Symmetry" by Armstrong.
 
Being unemployed, I'd like to find a free e-book
 
Amazon in the USA has used copies (apparently in good condition) for less than $15 including shipping. A new paperback is about twice that price. Books are always a worthy investment.
 

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