A new convolution formula for characteristic polynomials of finite geometric semilattices that generalizes an earlier identity at s=1 and yields a related expansion for hyperplane arrangements.
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Convolution-type Identity for Characteristic Polynomials of Geometric Semilattices
A new convolution formula for characteristic polynomials of finite geometric semilattices that generalizes an earlier identity at s=1 and yields a related expansion for hyperplane arrangements.