Geodesic
Rank of the Sum of Certain Matrices
Canadian mathematical bulletin, Tome 14 (1971) no. 2, p. 257

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DOI

In this note we give a very elementary proof of a result of Meyer's [1]. Let r(A) be the rank of the matrix A. 
Gibson, P. M. Rank of the Sum of Certain Matrices. Canadian mathematical bulletin, Tome 14 (1971) no. 2, p. 257. doi: 10.4153/CMB-1971-046-6
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     title = {Rank of the {Sum} of {Certain} {Matrices}},
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