Characterizes partially isometric truncated Toeplitz operators A_ϕ and dual truncated Toeplitz operators D_ϕ for symbols ϕ = ūv where v divides θ, and describes the space of extremal vectors for the non-zero cases.
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Partially isometric truncated and dual truncated Toeplitz operators
Characterizes partially isometric truncated Toeplitz operators A_ϕ and dual truncated Toeplitz operators D_ϕ for symbols ϕ = ūv where v divides θ, and describes the space of extremal vectors for the non-zero cases.