Unitary matrices are the complex versions, and they are the matrix representations of linear maps on complex vector spaces that preserve "complex distances". If you have a complex vector space then …

A stronger notion is unitary equivalence, i.e., similarity induced by a unitary transformation (since these are the isometric isomorphisms of Hilbert space), which again cannot happen between a nonunitary …

Dec 6, 2020 · Show that if $A$ and $B$ are unitary matrices, then $C = A \\otimes B$ is unitary.

Jun 21, 2020 · prove that an operator is unitary Ask Question Asked 5 years, 10 months ago Modified 5 years, 9 months ago

Apr 26, 2021 · How to check if a matrix is unitary? Ask Question Asked 4 years, 11 months ago Modified 4 years, 11 months ago

Sep 14, 2021 · Unitary operators, inner products and unit operators with Dirac notation Ask Question Asked 4 years, 7 months ago Modified 4 years, 6 months ago

Jul 20, 2012 · On certain decomposition of unitary symmetric matrices Ask Question Asked 13 years, 9 months ago Modified 12 years, 3 months ago

Mar 26, 2023 · Unitary groups and special unitary groups Ask Question Asked 3 years ago Modified 3 years ago

May 7, 2023 · As a task was left the following statement: operators, multiplying by an argument are unitary equivalent iff corresponding measures are equivalent. In my case theorem holds for both …

Apr 23, 2021 · Find a unitary matrix given eigenvectors and eigenvalues Ask Question Asked 4 years, 11 months ago Modified 4 years, 11 months ago