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 Mar30 awarded Nice Answer Mar29 comment Prob. 14, Sec. 2.7 in Erwine Kreyszig's INTRODUCTORY FUNCTIONAL ANALYSIS WITH APPLICATIONS What if you let $x = e_i = (0, \ldots, 1, \ldots, 0)$ where the 1 occurs at the $i$-th position? Mar19 awarded Popular Question Feb22 revised Easy question about of space Polish minor language changes Feb10 comment Find all x numbers for $(x-1)(x-3) > 0$ When is a product of two numbers positive? When both are positive or both negative. Feb10 comment Why isn' t high order polynomial a good fit? en.wikipedia.org/wiki/Overfitting Feb10 comment discontinuity of a monotonic function @user43208: just open the image in a separate tab.. Feb10 comment How are these terms algebraically equivalent? -1 = 16 mod 17. Feb8 comment Using Fermat's Little theorem to find Fermat's last theorem question What is the 'first case'? Feb8 reviewed Approve Find $p$ such that $f$ defined by $f(x)=(|x|^\frac{d}{2}+|x|^d)^{-1}$ is in $L^p(R^d)$ Feb8 comment How to “see” that this expression is $>0$. For all $N-1\leq x\leq N$ you have that $1/x \geq 1/N$. Feb5 comment Are these circles orthogonal? @abel: well, you can always prove the above relation using complex numbers.. Feb5 answered Are these circles orthogonal? Feb5 reviewed Reject Boolean Simplification of A'B'C'+AB'C'+ABC' Jan15 reviewed Approve Regularized least squares Jan14 comment Base 10 proof strategy 10^n = (-1)^(n+1) mod 11 Jan7 answered Concrete Mathematics: Manipulation of Summation of Floor Jan7 comment Concrete Mathematics: Manipulation of Summation of Floor Do you also have a ] too much? In the first sum. Jan7 comment Concrete Mathematics: Manipulation of Summation of Floor What are the curly brackets? Dec18 reviewed Approve Integrals and f(x)dx