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Mårten W's user avatar
Mårten W's user avatar
Mårten W's user avatar
Mårten W
  • Member for 11 years, 4 months
  • Last seen this week
  • Lund, Sweden
22 votes

What is the inverse of the $\mbox{vec}$ operator?

10 votes
Accepted

Evaluation by methods of complex analysis $\int_{0}^{1} \frac{\ln(x+1)}{x^2+1} \mathrm{dx}$

9 votes
Accepted

What is the radius of convergence of $\frac{1}{1+x^2}$ at $x_0=0$?

9 votes
Accepted

Convert two points to line eq (Ax + By +C = 0)

9 votes

Is $f(z)=z^n$ holomorphic?

8 votes

How do I find the determinant of a 4x4 matrix when the diagonal is made up of variables?

7 votes

Evaluating $\int_{\mathbb{R}}\frac{\exp(-x^2)}{1+x^2}\,\mathrm{d}x$

6 votes
Accepted

Solving the improper integral $\int_0^{\infty}\frac{dx}{1+x^3}$

6 votes

What is the radius of convergence of $\frac{1}{1+x^2}$ at $x_0=0$?

6 votes
Accepted

Nonnegative orthogonal matrices

6 votes
Accepted

How to calculate $ \int \frac{x^3+x^2}{x^3-1} \mathrm{d}x$

5 votes
Accepted

Under what conditions is the identity |a-c| = |a-b| + |b-c| true?

5 votes

If you have a function $f(x)=\frac{x^2}{x}$, then is the function continuous at x=0?

5 votes
Accepted

Solve the triple integral $\int_{0}^{c}\int_{0}^{b}\int_{0}^{a}e^{-x-y-z}dxdydz$

5 votes
Accepted

Evaluating real integral using residue calculus: why different results?

5 votes
Accepted

Solving the improper integral $\int_0^{\infty} {e^{-ax}\cos{(bx)}} dx$

5 votes
Accepted

Integration of $\frac{\tan(x)}{\cos(x)}$

4 votes
Accepted

Computing derivative $x^{x^x}$

4 votes

Guess the terms in the sequence?

4 votes

What is the intuition behind the line integral for the center of mass?

4 votes

Solve matrix equation $XAX^*=B$ for $X$ in least squares sense

4 votes

The number of distinct real roots of a polynomial

4 votes

Confused as to how to prove the basis of dft is orthonormal

4 votes

6-letter strings from the word APPLES where L comes before E?

3 votes

How can you show that $f\delta′=f(0)\delta′−f′(0)\delta$ for a function f that is infinitely differentiable?

3 votes

Calculating a SQRT digit-by-digit?

3 votes

Demystify integration of $\int \frac{1}{x} \mathrm dx$

3 votes
Accepted

Finding $\displaystyle \lim_{x\to 0} \frac{\ln(3^{x}+1)-\ln(2)}{x}$

3 votes
Accepted

How to find Euler's angles?

3 votes

Are there any ways to evaluate $\int^\infty_0\frac{\sin x}{x}dx$ without using double integral?