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All questions asked by Mr Mxyzptlk

List all solved & unsolved questions asked by Mr Mxyzptlk

Magnetic monopole, vector-potential and differential forms

0   Physics Asked on 02/18/2021

electromagnetism  magnetic fields  magnetic monopoles  potential  topology 

On the functional square root of $x^2+1$

9   Mathematics Asked on 01/25/2021

function and relation composition  functional equations  functions  real analysis 

Is there a simple way to find all the solutions of $x_1 + x_2 + dots + x_k + dots + x_K = N$ when $x_k$s and $N$ are all non-negative integers?

2   Mathematics Asked on 01/25/2021

discrete mathematics  integer partitions  integer programming 

Minimizing the Schatten 1-norm over symmetric matrices.

2   Mathematics Asked on 01/25/2021

functional analysis  linear algebra  matrices  norm  spectral theory 

The frontier of a set

1   Mathematics Asked on 01/25/2021

baire category  metric spaces  real analysis 

express a matrix using Kronecker product

0   Mathematics Asked on 01/25/2021

kronecker product 

Approximating multiples of reals with integers

1   Mathematics Asked on 01/25/2021

real analysis 

How is this sentence written correctly in maths? (sets)

0   Mathematics Asked on 01/25/2021

elementary set theory  notation  proof writing  solution verification 

Let $n$ be an integer. If the tens digit of $n^2$ is 7, what is the units digit of $n^2$?

6   Mathematics Asked on 01/24/2021

contest math  elementary number theory 

Partitioning $mathbb{R}$ for given functions.

0   Mathematics Asked on 01/24/2021

measure theory 

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