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Jul
9
accepted Inverse of regular value is a submanifold, Milnor's proof
Jun
30
comment Determine subsequence of sequence
If you want any help you need to be more specific! Please give an explicit example of something you find difficult.
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.