FromCoefficientRules

FromCoefficientRules[list, {x1, x2, ...}] constructs a polynomial from a list of rules for exponent vectors and coefficients.

Examples

Construct a polynomial from coefficient rules:

FromCoefficientRules[{{2, 1} -> 3, {0, 0} -> 1}, {x, y}]

Create a multivariate polynomial:

FromCoefficientRules[{{1, 0} -> a, {0, 1} -> b, {0, 0} -> c}, {x, y}]

Please visit the official Wolfram Language Reference for more details.