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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

5 votes
2 answers
330 views

General additive function of probability

Let $H$ be a function of finite sequences of probabilities (non-negative numbers summing up to 1) into real numbers, such that: $H$ is continuous, $H$ is symmetric w.r.t. the order of its arguments, …
Piotr Migdal's user avatar
  • 1,612
2 votes
4 answers
1k views

Nth root of a matrix as an analytic function?

Let $A$ be a $k \times k$ invertible matrix over complex numbers. If it possible to write its nth root as an analytic function (i.e. power series in $A$)? EDIT: Complex coefficients can be functions …
Piotr Migdal's user avatar
  • 1,612
2 votes

An analogue of Hilbert-Schmidt theorem for multilinear forms

There is a thing called Majorana representation of the symmetric states, somehow related to your question. For $\dim H = 2$ and $\psi$ living in a symmetric subspace of $H^{\otimes n}$, we have $$\p …
Piotr Migdal's user avatar
  • 1,612
1 vote

about decomposition of a non-negative definite operators

In general the problem is hard and it is widely known in quantum physics as the question if a mixed quantum states is separable or not. The physical formulations is slightly different, as for the deco …
Piotr Migdal's user avatar
  • 1,612