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An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)


Oct
9
awarded  Reviewer
Oct
8
reviewed Close how to interpret this norm
Oct
7
reviewed Approve suggested edit on Why is $3^{(x-5)} + 3^{(x-7)} + 3^{(x-9)} = 91$?
Oct
7
reviewed Leave Open Evaluate limit: infinity - infinity?
Oct
7
reviewed Close Reference request: books that describe application of physical reasoning to mathematical problems
Oct
7
reviewed Close Show $a\in G$ is contained in $Z(G)$ iff $Z(a)=G$ for center and centralizer?
Oct
7
reviewed Close Prove this induction problem
Oct
7
reviewed Close Simplify sum notation with factorial and exponent
Oct
7
reviewed Close Proving that $\left|\Re\left( \frac{1+i\sqrt{7}}{2}\right)^n\right| \to \infty$
Oct
7
reviewed Close How do I show that $MSE(\hat{\theta}) = Var(\hat{\theta} ) + bias(\hat{\theta})^{2}$?
Oct
7
reviewed Close How ae these three order types on $Z_+ \times Z_+$ different?
Oct
7
reviewed Close Physical significance of the fact that the cardinality of the real number line is the same as a finite interval of the real number line
Oct
7
reviewed Leave Open A question in permutation
Oct
7
reviewed Leave Open Polynomials with coefficients $1$ or $2014$
Oct
7
reviewed Leave Open $ \lim_{x \rightarrow \ + \infty}(\sqrt{x^2 + 2x} - \sqrt{x^2 - 7x})$
Oct
7
reviewed Close Any two $n$-cycles are conjugate in $A_{n+2}$ if $ddn$ is o
Oct
7
revised Banach Fixed Point Theorem. Measurable version.
Replace $L>0$ by $0<\lambdada<1$
Oct
6
reviewed Close $X^{T}AX$ and $BX$ are independent when $BA=0$
Oct
6
reviewed Close Find all positive integer that $2^{2^n}+5 $ is a prime number.
Oct
6
reviewed Close Prove that $f_1=f_2=…=f_n$.