Algebraic geometry is the study of geometries that come from algebra, in particular, from rings. In classical algebraic geometry, the algebra is the ring of polynomials, and the geometry is the set of zeros of polynomials, called an algebraic variety. For instance, the unit circle is the set of zeros of x^2 + y^2 = 1 and is an algebraic variety, as are all of the conic sections.

algebraic curve | algebraic number theory | algebraic variety | category theory | commutative algebra | conic section | differential geometry | geometry | plane curve | scheme | space curve | Zariski topology