【摘 要】
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The complete cd-index of a Bruhat interval is a non-commutative polynomial in the variables c and d, which was introduced by Billera and Brenti.They also conjec
【机 构】
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CollegeofMathematics,SichuanUniversity
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The complete cd-index of a Bruhat interval is a non-commutative polynomial in the variables c and d, which was introduced by Billera and Brenti.They also conjectured that the coefficients of these polynomials are non-negative.For a cd-monomial M containing at most one d, i.e., M =ci or M =cidcj(i,j ≥ 0), Karu showed that the coefficient of M is non-negative.
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