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Published online by Cambridge University Press: 20 November 2018
Hall's algebra (3) is an algebra over the field V(p) of rational functions in the indeterminate p with coefficients in the field V of complex numbers. The basis of the algebra consists of elements Gλ which are in one-one correspondence with the set of all partitions (λ) and whose multiplication "constants" are the "Hall polynomials" , i-e.