(adsbygoogle = window.adsbygoogle || []).push({}); Can you rephrase the question? What is "e"?

Is {A e Mn,n | AB = BA for a fixed B e Mn,n a subspace of Mn,n? (where Mn,n is a matrix M, of dimension n by n)? Not having had a logic class, I have /no idea/ what this is asking...

I'm not even sure what the e is. Its a small capital e - looks like a greek letter. Equivalent to?

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# Can you rephrase the question? What is e ?

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