Wikipedia:Reference desk/Archives/Mathematics/2007 March 1
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[edit] March 1
[edit] Apparently trivial abstract algebra problem
The following problem appears in my abstract algebra textbook (Hungerford):
- Prove or disprove: Let R be a Euclidean domain; then
is an ideal in R.
This seems trivial to me: just take 
and δ(n) = | n | ; then I is not an ideal (it isn't even closed under addition). But the problem was in the "fairly hard" section, so I think I must be missing something. Maybe there's a typo? —Keenan Pepper 05:35, 1 March 2007 (UTC)
- As I recall, in order for a subring of a Euclidean domain to be an ideal, it would absolutely have to contain 0; the I you describe above necessarily does not contain 0, hence cannot be an ideal. So no, I don't think you're missing something, I think it is just an easy problem. –King Bee (T • C) 14:00, 1 March 2007 (UTC)
[edit] Valuation of American Options Whaley Method
Hey, I'd like to have the derivation and equation for valuation of american options by the Whaley method.
[edit] Help with taking limits
i need help taking a limit as x goes to +0....of X^X^X....65.110.228.117 19:42, 1 March 2007 (UTC)State
, and then use that result to evaluate the limit you actually want to evaluate. –
