SOLVED: Theorem 4.4.4. (Closed Graph Theorem). Let XY be Banach spaces and T D a closed linear operator defined on closed subspace D € X Then T bounded:. To appreciate the Closed
functional analysis - A Basic Question about Interpreting Closed Graph Theorem - Mathematics Stack Exchange
BASIC FUNCTIONAL ANALYSIS WITH APPLICATIONS Contents 1. Banach and Hilbert spaces 1 2. Bounded, unbounded, and compact operators