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Conjugate transpose : ウィキペディア英語版
Conjugate transpose

In mathematics, the conjugate transpose or Hermitian transpose of an ''m''-by-''n'' matrix ' with complex entries is the ''n''-by-''m'' matrix '
*
obtained from ' by taking the transpose and then taking the complex conjugate of each entry (i.e., negating their imaginary parts but not their real parts). The conjugate transpose is formally defined by
:(\boldsymbol^
*)_ = \overline}
where the subscripts denote the ''i'',''j''-th entry, for 1 ≤ ''i'' ≤ ''n'' and 1 ≤ ''j'' ≤ ''m'', and the overbar denotes a scalar complex conjugate. (The complex conjugate of a + bi, where ''a'' and ''b'' are reals, is a - bi.)
This definition can also be written as
:\boldsymbol^
* = (\overline = \overline}
where \boldsymbol^\mathrm \,\! denotes the transpose and \overline^
* \,\! or \boldsymbol^\mathrm \,\!, commonly used in linear algebra
* \boldsymbol^\dagger \,\! (sometimes pronounced as "' dagger"), universally used in quantum mechanics
* \boldsymbol^+ \,\!, although this symbol is more commonly used for the Moore–Penrose pseudoinverse
In some contexts, \boldsymbol^
* \,\! denotes the matrix with complex conjugated entries, and the conjugate transpose is then denoted by \boldsymbol^^ \,\!.
==Example==
If
:\boldsymbol = \begin 1 & -2-i \\ 1+i & i \end
then
:\boldsymbol^
* = \begin 1 & 1-i \\ -2+i & -i\end

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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