New posts in Projection Matrices

Is this projection matrix?

When is the sum and difference of two projection matrices $P_1$ and $P_2$ a projection matrix?

Uniqueness of trace as linearization of the rank

Proving a given formula for projection matrix

Product of a vector and its transpose (Projections)

Prove that the projection operator $\mathbb P_+\equiv|+z\rangle\!\langle +z|$ is Hermitian

Why is a projection matrix symmetric?

Diagonalization of a projection