Linear Algebra by Jörg Liesen & Volker Mehrmann

Linear Algebra by Jörg Liesen & Volker Mehrmann

Author:Jörg Liesen & Volker Mehrmann
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham


The prefix sesqui is Latin and means “one and a half”. Note that a sesquilinear form is linear in the first variable and semilinear (“half linear”) in the second variable.

The following result characterizes Hermitian sesquilinear forms.

Lemma 11.18

A sesquilinear form on the -vector space is Hermitian if and only if for all .

Proof

If s is Hermitian then, in particular, for all , and thus .

If, on the other hand, , then by definition

(11.1)

(11.2)

The first equation implies that , since by assumption. The second equation implies analogously that . Therefore,



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