• transpose or dual system
or equivalently
• conjugate system
or
equivalently
In particular, we
have G*(jw):=[G(jw)]*=G˜(jw).
• inverse system:
Let D+ denote a right (left) inverse of D if D has full row
(column) rank.
Then
is a right (left)
inverse of G, I.e, GG+=I (G+G=I).