, A.2. Positive definite operators. A symmetric operator N : C 0 (D) ? M 0 (D) is called positive definite if it satisfies N f, f > 0 for any f ? C 0 (D) \ {0}. A similar definition holds for operators R : M 0 (D) ? C 0 (D)
, Proposition A.2 (On symmetric and positive definite operators)
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