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Songqui Wang ect, Inequality of matrix[M] (the second press), Science press, Beijing (2006).2.Tingming Wang, From Proof of inequality of matrix-rank by the block matrix construction (J, Higher mathematics (2008)).3.Wajin Zhuang, Guaidance of matriz theory on skew field (MI, Science press, Beijing (2006)). Ian S. Murphy, The rank of the sumof two rectangular matrices. Canad. Math. Bull. 13(1970), 384.5.L. Mirsky, An Introduction to Linear Algebra, Oxford Univ. Press, 1955.