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Math Help - prove trig identity by using commutative ring theory

  1. #1
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    prove trig identity by using commutative ring theory

    How would one go about proving a trig identity(choose one) by using commutative ring theory?. PH, this looks like a good one for you.

    There was an article in the Mathematical Gazette regarding this, but I didn't get to see it. An old issue.
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    Quote Originally Posted by galactus View Post
    How would one go about proving a trig identity(choose one) by using commutative ring theory?. PH, this looks like a good one for you.

    There was an article in the Mathematical Gazette regarding this, but I didn't get to see it. An old issue.
    If you know the issue and its in the last 20 years I probably have a copy
    (though I might be killed in the avalanche extracting it would cause)

    RonL (1 year into a 2 year wait for his note in MG to be published)
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    What does that mean "prove trigonometry identity using ring theory"
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    Quote Originally Posted by ThePerfectHacker View Post
    What does that mean "prove trigonometry identity using ring theory"
    That's all I know, PH. Thought it would be interesting. I am sorry, CB, it was the Mathematics Magazine, not Gazette.

    It is vol. 47, no. 4, September 1974, pages 226-227

    Pretty old issue. If you have it, that'd be cool.

    There is a book out by MAA entitled, "The Harmony of the World, 75 years of Mathematics Magazine".

    It is a complialtion of the best of Math Magazine. The aforementioned is one of the articles.
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    Quote Originally Posted by galactus View Post
    That's all I know, PH. Thought it would be interesting. I am sorry, CB, it was the Mathematics Magazine, not Gazette.

    It is vol. 47, no. 4, September 1974, pages 226-227

    Pretty old issue. If you have it, that'd be cool.

    There is a book out by MAA entitled, "The Harmony of the World, 75 years of Mathematics Magazine".

    It is a complialtion of the best of Math Magazine. The aforementioned is one of the articles.
    Even if it were the MG rather than MM 74 would be too long ago.

    RonL
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    20 years, that is a long time .
    Maybe you can find it on the internet?

    By the way: Do you like the theorem in my signature? I find it so amazing.
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    I found this on the internet:

    http://links.jstor.org/sici?sici=002...3E2.0.CO%3B2-M

    It is the article, but they want $12 for it. It's in JSTOR.

    The book I mentioned would be nice to have, but I am not paying $45 for it.
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