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Self-teaching worker
  • Member for 10 years, 6 months
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  • The Piemont-Liguria Ocean
20 votes
2 answers
1k views

Mathematical meaning of certain integrals in physics

13 votes
1 answer
220 views

A version of Ampère's law

10 votes
2 answers
3k views

Dirac's delta in 3 dimensions: proof of $\nabla^2(\|\boldsymbol{x}-\boldsymbol{x}_0\|^{-1})=-4\pi\delta(\boldsymbol{x}-\boldsymbol{x}_0)$

10 votes
1 answer
1k views

Definitions of Lebesgue integral

8 votes
1 answer
2k views

Completeness of the space of sets with distance defined by the measure of symmetric difference

8 votes
2 answers
755 views

$(\mathbb{Z}/p^r\mathbb{Z})^{\ast}$ is a cyclic group

8 votes
2 answers
220 views

No proposition $\chi$ such that $\mathscr{M}\models\chi\iff\mathscr{M}$ is infinite

8 votes
2 answers
2k views

Function measurable iff the components are?

7 votes
1 answer
1k views

A differentiation under the integral sign

7 votes
2 answers
20k views

$AB=BA$ with same eigenvector matrix

7 votes
1 answer
1k views

Generalised derivative of Cantor staircase

6 votes
3 answers
2k views

Undecidability and completeness

6 votes
3 answers
10k views

Spectrum of self-adjoint operator on Hilbert space real

6 votes
1 answer
266 views

Approximating a piecewise continuous function with a function in $\mathcal{C}^{\infty}_{0}(\mathbb{R})$

6 votes
3 answers
600 views

De Morgan laws of linear logic

6 votes
1 answer
1k views

A commutation between curl and integral

5 votes
0 answers
167 views

An integral giving back a function which is a factor in the integrand

5 votes
2 answers
311 views

Integral of an unbounded function as a solution of $\nabla^2\boldsymbol{A}=-\mu_0\boldsymbol{J}$

5 votes
1 answer
170 views

$\land,\lor$ and $\lnot$ determinate a functionally complete basis

5 votes
0 answers
2k views

Derivative of norm in Hilbert space

5 votes
0 answers
146 views

Conditions for Taylor formula

5 votes
2 answers
299 views

Definitions of Boolean algebras

5 votes
1 answer
555 views

Axioms defining a Turing machine

5 votes
1 answer
412 views

Symmetric relations and $\varphi\rightarrow\square\diamond\varphi$

5 votes
2 answers
280 views

$\int_{\mathbb{R}}f(x)e^{-ixz}d\mu_x$ analytic for $f\in L_1$

5 votes
1 answer
430 views

Relative countable weak$^{\ast}$ compactness and sequences

5 votes
1 answer
2k views

Intersection of nested closed bounded convex sets in Euclidean space

4 votes
1 answer
447 views

Convex interior topology

4 votes
2 answers
9k views

Derivative of Fourier transform: $F[f]'=F[-ixf(x)]$

4 votes
1 answer
455 views

Fourier transform inversion formula for $f\in L_1(\mathbb{R}^n)$ and Dini condition

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