optimization - Does K-fold I-sum of a mxn matrix totally unimodular? -


how show whether k-fold i-sum of mxn matrix totally unimodular or not.

here matrix:

i i ... 0 0 ... 0 0 0 ... 0 0 0 ... 0 0...0 a...0 ........a.0 0 0 0 ...

here,

i nxn identity matrix.

a mxn matrix.


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