Divisor (algebraic Geometry)
In algebraic geometry, divisors are a generalization of codimension one subvarieties of algebraic varieties; two different generalizations are in common use, Cartier divisors and Weil divisors (named for Pierre Cartier and André Weil). These concepts agree on non-singular varieties.
Read more about Divisor (algebraic Geometry): Divisors in A Riemann Surface, Weil Divisor, Cartier Divisor, From Cartier Divisors To Weil Divisor, From Cartier Divisors To Line Bundles, Global Sections of Line Bundles and Linear Systems