Consider the equation $$XA=BX,$$ where $X,A,B$ could be matrices or (pseudo) differential operators.
How to represent $X$ using $A,B$, that is $$X=f(A,B),$$ where $f$ is a known function.
Consider the equation $$XA=BX,$$ where $X,A,B$ could be matrices or (pseudo) differential operators.
How to represent $X$ using $A,B$, that is $$X=f(A,B),$$ where $f$ is a known function.
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