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Trace (linear algebra) - Wikipedia - that is, the trace of a square matrix equals the sum of the eigenvalues counted with multiplicities. Trace of commutator. When both A and B are n × n matrices, the trace of the (ring-theoretic) commutator of A and B vanishes: tr([A,B]) = 0, because tr(AB) = tr(BA) and tr is linear. One can state this as "the trace is a map of Lie algebras gl n → k from operators to scalars", as the ...
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Wikipedia, the free encyclopedia - Michelle Williams (born September 9, 1980) is an American actress. Her accolades include two Golden Globe Awards, and she has been nominated for four Academy Awards and one Tony Award.She made her feature film debut in Lassie (1994), and starred in the television teen drama series Dawson's Creek (1998–2003). She earned her first Academy Award nomination playing the wife of a gay man in ...
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