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{\bf Peter J. McNamara}
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{\bf Factorial Grothendieck Polynomials}
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In this paper, we study Grothendieck polynomials indexed by
Grassmannian permutations from a combinatorial viewpoint. We
introduce the factorial Grothendieck polynomials which are
analogues of the factorial Schur functions, study their
properties, and use them to produce a generalisation of a
Littlewood-Richardson rule for Grothendieck polynomials.
\bye