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Maximal and minimal extensions

From Encyclopedia of Mathematics - Reading time: 1 min

of a symmetric operator A

The operators A¯ (the closure of A, cf. Closed operator) and A (the adjoint of A, cf. Adjoint operator), respectively. All closed symmetric extensions of A occur between these. Equality of the maximal and minimal extensions is equivalent to the self-adjointness of A (cf. Self-adjoint operator) and is a necessary and sufficient condition for the uniqueness of a self-adjoint extension.


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References[edit]

[a1] M. Reed, B. Simon, "Methods of modern mathematical physics" , 1. Functional analysis , Acad. Press (1972) pp. Chapt. 8

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