We study the following question: suppose that A and ℬ are two algebras of complex n × n matrices such that the ring commutator [A, B] = AB – BA is "small" for each A ∈ A and B ∈ ℬ; does this imply ...

, Juan J. Font, Linear Isometries Between Subspaces of Continuous Functions, Transactions of the American Mathematical Society, Vol. 349, No. 1 (Jan., 1997), pp. 413-428 ...