quadratic integer

Meaning

Noun

• A number (real or complex) which is a solution to an equation of the form $x^2\; +\; Bx\; +\; C\; =\; 0$ for some integers B and C. For example 42, or 2+3i, or $1+\backslash sqrt\{-3\}\; \backslash over\; 2$.

Related

Narrower meaning words

• Gaussian integer / Eisenstein integer
• phi, golden ratio

Broader meaning words

• algebraic integer

Origin

• . The idea of integer here is that if the coefficient of the $x^2$ term is set to 1 (i.e., if the polynomial is made monic), the other coefficients are integers.