TeX source:

\mathbf{A}_{\text{even}} = |00\rangle\langle00| + |11\rangle\langle11|, \qquad \mathbf{A}_{\text{odd}} = \mathbf{I} - \mathbf{A}_{\text{even}} = |01\rangle\langle01| + |10\rangle\langle10|,