C*-supports are unique exactly when the generated C*-algebra lies in every injective envelope, yielding new characterizations of unique extension and hyperrigidity and a formula for the span of abnormalities.
II, Acta Math.128(1972), no
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$C^*$-supports and abnormalities of operator systems
C*-supports are unique exactly when the generated C*-algebra lies in every injective envelope, yielding new characterizations of unique extension and hyperrigidity and a formula for the span of abnormalities.