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Mar
30
awarded  Nice Answer
Mar
29
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?
Mar
19
awarded  Popular Question
Feb
22
revised Easy question about of space Polish
minor language changes
Feb
10
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.
Feb
10
comment Why isn' t high order polynomial a good fit?
en.wikipedia.org/wiki/Overfitting
Feb
10
comment discontinuity of a monotonic function
@user43208: just open the image in a separate tab..
Feb
10
comment How are these terms algebraically equivalent?
-1 = 16 mod 17.
Feb
8
comment Using Fermat's Little theorem to find Fermat's last theorem question
What is the 'first case'?
Feb
8
reviewed Approve Find $p$ such that $f$ defined by $f(x)=(|x|^\frac{d}{2}+|x|^d)^{-1}$ is in $L^p(R^d)$
Feb
8
comment How to “see” that this expression is $>0$.
For all $N-1\leq x\leq N$ you have that $1/x \geq 1/N$.
Feb
5
comment Are these circles orthogonal?
@abel: well, you can always prove the above relation using complex numbers..
Feb
5
answered Are these circles orthogonal?
Feb
5
reviewed Reject Boolean Simplification of A'B'C'+AB'C'+ABC'
Jan
15
reviewed Approve Regularized least squares
Jan
14
comment Base 10 proof strategy
10^n = (-1)^(n+1) mod 11
Jan
7
answered Concrete Mathematics: Manipulation of Summation of Floor
Jan
7
comment Concrete Mathematics: Manipulation of Summation of Floor
Do you also have a ] too much? In the first sum.
Jan
7
comment Concrete Mathematics: Manipulation of Summation of Floor
What are the curly brackets?
Dec
18
reviewed Approve Integrals and f(x)dx