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Picaud Vincent
  • Member for 5 years, 1 month
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13 votes
Accepted

Derivative of inner product

11 votes

Why is the Absolute value / modulus function used?

10 votes

How to calculate the pullback of a $k$-form explicitly

9 votes

If $A$ and $B$ are invertible matrices, is $A+B$ invertible too?

8 votes
Accepted

Understanding Finite element method

5 votes

Newton vs Leibniz notation

5 votes
Accepted

Trouble understanding coordinate systems as charts on differentiable manifolds.

5 votes

Surprising applications of cohomology

5 votes

Is the derivative of a continuously differentiable function always integrable?

5 votes

Derivative is just speed of change?

4 votes
Accepted

Why does the fourier transform invert scales?

4 votes
Accepted

Show $f(x) = \ln\ (\sum_{i=1}^n e^{\langle a_i, x\rangle})$ is convex

4 votes

Evaluating $\sum_{k=1}^{n} \frac{1}{k(k+1)}$

4 votes
Accepted

Partial Differential Equations Question: State if the following PDEs are linear homogeneous, linear nonhomogeneous, or nonlinear:

4 votes

Why, in topology, is continuity defined with inverse images?

3 votes
Accepted

1 norm $\|\|_1$, of non square matrix

3 votes

Prove Convergence with ratio test for series $\sum_{n=1}^{\infty} (\prod_{i = 1}^{n} = \frac{i}{2i-1}) $

3 votes
Accepted

Can every orthogonal matrix be written as a product of Givens rotations?

3 votes

Why does $z^n-1=0$ have at max n solutions? $z\in\mathbb{C}$

3 votes

Can one stick with explicit ode solver forever? Given enough small time step.

3 votes
Accepted

How to make it formally correct?

3 votes

Weierstrass approximation theorem. Approximation of |x|.

3 votes

Simpler proof that $y^3[d^2y/dx^2]$ is a constant if $y^2=ax^2+bx+c$?

3 votes

Does the following integral converge or diverge and can it be solved?

3 votes
Accepted

How do I show that these two vectors are dependent

3 votes
Accepted

Differential Forms without Leibniz notation

2 votes

Lagrange multiplier issue

2 votes
Accepted

"Determine the vectorial subspace of the vectorial space R3 generated by:", without using matrices

2 votes

What is the sum of the coefficients of the generating function for Chebyshev polynomials?

2 votes

Upper bound on Sum of square roots