A conjugate matrix is a matrix obtained from a given matrix
by taking the complex conjugate of each element of
(Courant and Hilbert 1989, p. 9), i.e.,
The notation is sometimes also used, which can lead to confusion since this symbol is also used to denote the conjugate transpose.
Using a matrix in a similarity transformation
of a given matrix
is also known as conjugating
by
. In this case,
and
are known as similar matrices.