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What does commutant lifting theorem mean?

Looking for the meaning or definition of the word commutant lifting theorem? Here's what it means.

Proper noun
  1. (mathematics) A theorem in operator theory, stating that, if T is a contraction on a Hilbert space H, and U is its minimal unitary dilation acting on some Hilbert space K, and R is an operator on H commuting with T, then there is an operator S on K commuting with U such that
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