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Matrix theory is the study of matrices as concrete objects, rather than as abstract linear operators between vector spaces (whose study belongs to linear algebra). For instance, this involves matrix factorizations and decompositions, nonnegative matrices and Perron-Frobenius theory, Schur complements, structured and special matrices, matrix functions and equations.
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Vanishing zeroes in matrix powers
There is an example in the book "Essentials of Stochastic processes" of Durrett, which shows that, in general, $m$ need not be equal to $2n-2$ (it is Example 4.5 of the chapter devoted to Markov chain …