Short History
The theory of unbounded operators was stimulated by attempts in the late 1920s to put quantum mechanics on a rigorous mathematical foundation. The systematic development of the theory is due to John von Neumann and Marshall Stone. The technique of using the graph to analyze unbounded operators was introduced by von Neumann in. (Reed & Simon 1980, Notes to Chapter VIII, page 305)
Read more about this topic: Closed Operator
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