Maximum likelihood degree of Fermat hypersurfaces via Euler characteristics

Maximum likelihood degree of a projective variety is the number of critical points of a general likelihood function. In this note, we compute the Maximum likelihood degree of Fermat hypersurfaces. We give a formula of the Maximum likelihood degree in terms of the constants $β_{μ, ν}$, which is defined to be the number of complex solutions to the system of equations $z_1^ν=z_2^ν=\cdots=z_μ^ν=1$ and $z_1+\cdots +z_μ+1=0$.

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