euler -- Euler characteristic

Ways to use euler :

• euler(CoherentSheaf) -- Euler characteristic of coherent sheaf
• euler(Ideal) -- Euler characteristic
• euler(Module) -- Euler characteristic
• euler(ProjectiveHilbertPolynomial) -- constant term of the Hilbert polynomial
• euler(ProjectiveVariety) -- topological Euler characteristic of a (smooth) projective variety
• euler(Ring) -- Euler characteristic