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seen Nov 19 '12 at 19:41

Jan
17
awarded  Editor
Jan
17
revised How to deduce the area of sphere in polar coordinates?
deleted 2 characters in body; added 2 characters in body
Jan
17
answered How to deduce the area of sphere in polar coordinates?
Jan
17
comment How to deduce the area of sphere in polar coordinates?
@hhh: Do know what a Jacobian is? You've probably encountered it while calculating the area element in polar coordinates.
Jan
16
comment For what n does $n^2 + 2010$ divide $n^3 + 2010$
@MrZeta: you're definitely right; I should have specified that I meant larger 'in absolute sense', $|f(n)|.$
Jan
16
comment For what n does $n^2 + 2010$ divide $n^3 + 2010$
@MrZeta: I wasn't sure if you meant $\mathbb{N} = \{1, 2, 3, \cdots\}$ or $\mathbb{Z}$ (which is what you suggest, and what I call the set of integers). Exactly what point don't you understand? (By the way, I did cheat and change the sign of $k$ halfway through, sorry for that.) To me it seems easiest to try to find any integer solutions, otherwise you have to start worrying about signs. In the end you can discard any negative solutions.
Jan
16
awarded  Teacher
Jan
16
answered For what n does $n^2 + 2010$ divide $n^3 + 2010$