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Paper   IPM / M / 148
School of Mathematics
  Title:   On the bases for trades
1.  G. B. Khosrovshahi
2.  Ch. Maysoori
  Status:   Published
  Journal: Linear Algebra Appl.
  Vol.:  226-228
  Year:  1995
  Pages:   731-748
  Supported by:  IPM
In recent years, the algebraic and combinatorial properties of inclusion matrices of t-subsets versus k-subsets of a v-set X have been the focus of attention by some authors. We first make a comparative study of the known bases for the Z-modules generated by trades (the elements of the null space of these matrices), and then, by utilizing these bases, we note that a large family of new bases can by produced.

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