Linear Algebra Done Right
《Linear Algebra Done Right》 · 第 231 页 · Section 7A「Self-Adjoint and Normal Operators」，Definition 7.7
The conjugate transpose of an $m$-by-$n$ matrix $A$ is the $n$-by-$m$ matrix $A^*$ obtained by interchanging rows and columns and then taking the complex conjugate of each entry. In other words, $(A^*)_{j,k}=\overline{A_{k,j}}$.