In mathematics, a ternary quartic form is a degree 4 homogeneous polynomial in three variables. == Hilbert's theorem == Hilbert (1888) showed that a positive semi-definite ternary quartic form over the reals can be written as a sum of three squares of quadratic forms.
In mathematics, a ternary quartic form is a degree 4 homogeneous polynomial in three variables. == Hilbert's theorem == Hilbert (1888) showed that a positive semi-definite ternary quartic form over the reals can be written as a sum of three squares of quadratic forms.
Source: Wikipedia "Ternary quartic" · CC BY-SA 4.0
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