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Richard Ricciardelli

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#streeart in Mexico
by artist Emmanuel Cruz.
Photo by Graffiti and Street art.
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Richard Ricciardelli

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This is page ix of Algebra: Abstract and Concrete, by  Frederick M. Goodman.

You can find the whole book at his homepage, http://homepage.divms.uiowa.edu/%7Egoodman/index.html
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Richard Ricciardelli

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"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former". Albert Einstein.
Introduction
Living on a pale blue dot.