A subset X of an abelian group @C, written additively, is a Sidon set of orderh if whenever {(a"i,m"i):i@?I} and {(b"j,n"j):j@?J} are multisets of size h with elements in X and @?"i"@?"Im"ia"i=@?"j"@?"Jn"jb"j, then {(a"i,m"i):i@?I}={(b"j,n"j):j@?J}. The ...
Rough set theory is an important technique in knowledge discovery in databases. In covering-based rough sets, seven types of rough set models were established in recent years. This paper defines the concept of maximal description of an element, and ...
In this paper, we present an eigenvalue decomposition for any complex persymmetric Hankel matrix with at most three non-zero anti-diagonals. Furthermore, we derive a general expression for the natural powers of these Hankel matrices in terms of the ...
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