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Genus of a curve equals to -1 in SageMath

What does it mean when Sage computes genus of a projective plane curve to be -1?

Input:

x,y,z = QQ['x,y,z'].gens()
C = Curve(x^4 + 10*x^2*y*z + 5*y^2*z^2)
C.genus()

Output:

-1

Genus of a curve equals to -1 in SageMath

What does it mean when Sage computes genus of a projective plane curve to be -1?

Input:

x,y,z = QQ['x,y,z'].gens()
C = Curve(x^4 + 10*x^2*y*z + 5*y^2*z^2)
C.genus()

Output:

-1