Primitive Quadratic Form
A quadratic form a*xx + b*xy + c*yy is primitive if the greatest common divisor
of the three coefficients a, b, c is equal to 1.
Examples:
- 6xx - 10xy + 15yy is primitive since gcd(6, -10, 15) = 1.
- 6xx - 10xy + 14yy is not primitive since gcd(6, -10, 14) = 2.
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