Term rank preservers of Boolean matrices

What is it about?

We obtain some characterizations of linear operators that preserve the term rank of Boolean matrices. That is, a linear operator over Boolean matrices preserves the term rank if and only if it preserves the term ranks 1 and k(6¼1) if and only if it preserves the term ranks 2 and l(6¼2). Other characterizations of term rank preservers are given.

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