Spear Operators Between Banach Spaces by Vladimir Kadets, Miguel Martín, Javier Merí, Antonio Pérez.
This monograph is devoted to the study of spear operators, that is, bounded linear operators $G$ between Banach spaces $X$ and $Y$ satisfying that for every other bounded linear operator $T:X longrightarrow Y$ there exists a modulus-one scalar $ omega$ such that $
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