# Thread: prove trig identity by using commutative ring theory

1. ## 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.

2. Originally Posted by galactus
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)

3. What does that mean "prove trigonometry identity using ring theory"

4. Originally Posted by ThePerfectHacker
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.

5. Originally Posted by galactus
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

6. 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.

7. 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.