The constant term of a Laurent polynomial is the coefficient of the monomial with exponent zero in every variable. Taking the constant term in just one variable leaves a Laurent polynomial in the other variables; successive extractions recover the full constant term. This operation is linear, but need not preserve products. The Dyson constant-term identity is a multivariate example of coefficient extraction.
Articles by others on the same topic
In mathematics, a constant term refers to a term in an algebraic expression that does not contain any variables. It is a fixed value that remains the same regardless of the values of the other variables in the expression. For example, in the polynomial expression \( 3x^2 + 5x + 7 \), the constant term is \( 7 \), since it does not depend on the variables \( x \).