hilbertPolynomial X
The Hilbert polynomial of a smooth projective toric variety $X$ is the Euler characteristic of $OO_X(i_0,i_1,...,i_r)$ where $r$ is the rank of the Picard group of $X$ and $i_0,i_1,...,i_r$ are formal variables. The Hilbert polynomial agrees with the Hilbert function when evaluated at any point in the nef cone.
On projective space, one recovers the standard Hilbert polynomial.
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The Hilbert polynomial of a product of normal toric varieties is simply the product of the Hilbert polynomials of the factors.
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Example 2.9 in [Diane Maclagan and Gregory G. Smith, Uniform bounds on multigraded regularity, J. Algebraic Geom. 14 (2005), 137-164] describes the Hilbert polynomials on a Hirzebruch surface.
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The Hilbert polynomial is computed using the Hirzebruch-Riemann-Roch Theorem. In particular, this method depends on the Schubert2 package.