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deleted 382 characters in body; added 20 characters in body
Harry Gindi
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Edit: My mistake, I misread your post. Here's the correct answer.

http://books.google.com/books?id=FJmiSW1KRBAC&lpg=PP1&ots=k1ecm3FdbZ&dq=lang%20algebra&pg=PA251#v=onepage&q=&f=false

Proposition 6.11

Harry Gindi
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  • 215