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seen Dec 30 '12 at 1:00

Sep
6
awarded  Yearling
Oct
2
comment Show that $\sum_{n=1}^\infty \frac {\sqrt{a_n}}{n}$ converges if $\sum_{n=1}^\infty{a_n}$ does provided that $a_n>0$
You have to pay attention when you say $a_n$ converges although you mean the convergence of $\sum_{n=1}^\infty{a_n}$! I edited my answer.
Oct
2
revised Show that $\sum_{n=1}^\infty \frac {\sqrt{a_n}}{n}$ converges if $\sum_{n=1}^\infty{a_n}$ does provided that $a_n>0$
added 1003 characters in body
Sep
30
answered Show that $\sum_{n=1}^\infty \frac {\sqrt{a_n}}{n}$ converges if $\sum_{n=1}^\infty{a_n}$ does provided that $a_n>0$
Sep
29
awarded  Critic
Sep
28
answered Proving that $x^3 +1=15x$ has at most three solutions. in the interval [-4,4].
Sep
21
revised If $A$ is symmetric show that $(BA^{-1})^T(A^{-1}B^T)^{-1}=I$
added 151 characters in body
Sep
21
answered If $A$ is symmetric show that $(BA^{-1})^T(A^{-1}B^T)^{-1}=I$
Sep
20
comment Prime ideals in $\mathbb{Z}[x]$
math.lsu.edu/~hoffman/7280alggeom/lect37.pdf
Sep
14
comment $\overline A - \overline B \subset \overline{A - B}$
You should replace sequences by nets here, which will also lead to the goal.
Sep
14
comment Spivak's Calculus (Chapter 5, Problem 41): Proof that $\lim_{x \to a} x^2 = a^2$
I don't see any fallacy.
Sep
14
revised How many multiples of two primes equal eachother
edited body
Sep
14
revised How many multiples of two primes equal eachother
added 118 characters in body
Sep
14
answered How many multiples of two primes equal eachother
Sep
14
revised $\overline A - \overline B \subset \overline{A - B}$
deleted 5 characters in body
Sep
14
answered $\overline A - \overline B \subset \overline{A - B}$
Sep
13
awarded  Supporter
Sep
13
awarded  Nice Answer
Sep
13
answered How does one show that $\lim_{n \rightarrow \infty}\int_{0}^{1}\frac{x^{n}}{1 + x^{n}}\, dx = 0$?
Sep
7
awarded  Teacher