Robert Israel
Reputation
100/100 score
 34m answered Is this equality correct? 43m answered Find a sequence of measurable functions defined on a measurable set $E$ that converges everywhere on $E$, but not almost uniformly on $E$. 2h answered Why is $\Delta u$ bounded, if $u\in C^2(\overline{\Omega})$ and $\Omega\subseteq\mathbb{R}^n$ is a bounded domain? 2h answered Contest Problem 2h answered Computability: is there an alternative method to decide this language? 11h answered Solving a system of ODEs with variable in matrix A 11h answered Representation of a matrix as product of unitary matrices and diagonal matrix 11h answered How can I prove $\phi(m)*\phi(n) = \phi(lcm(m,n))* \phi(\gcd(m,n))$ where $\phi$ is eulers $\phi$ function? 17h answered Show that f(x) is convex 22h answered Finite field, how to satisfy equation? 22h answered Linear Algebra-invariant subspaces 23h answered If each term in a sum converges, does the infinite sum converge too? 23h answered How to fastest approximate definite integrals 1d answered finding the value of a node in Pascal’s (a.k.a Yanghui's) triangle 1d answered Counter Example to Tietze Extension Property for Arbitrary Topological Space 1d answered Floor inequality: $\lfloor x+y\rfloor\ge \lfloor x\rfloor+\lfloor y\rfloor$ 1d answered Conditions on $f(t)$ so that $\int_{-\infty}^\infty f(t) \operatorname{sinc}(t-a) \operatorname{sinc}(t-b) dt$ converges. 1d answered Finding integer solutions of $m^2-n^5 = m - n$ 1d answered What is the connection between $V(\vec x) = \frac{1}{2}(x_1^2+x_1x_2+x_2^2)$ and $V(\vec x) = \frac {1}{2} x^TPx$? 1d answered Convergence Sequence on compact set