Given a matrix $M$ what are the standard techniques for showing that $M$ is totally unimodular. I've already attempted to use the approach on wikipedia, but it will doesn't apply in my case. Are there other techniques for showing that a matrix is totally unimodular.
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there is a theorem that says if you have two of {1,-1} in each column, and sum of each row goes to 0, then this matrix is TU – YOUSEFY Nov 15 '17 at 10:26