SGA (Séminaire de Géométrie Algébrique)

SGA (Séminaire de Géométrie Algébrique) is a series of influential mathematical lectures and publications from the 1960s that advanced algebraic geometry. It brought together leading mathematicians to develop and formalize ideas about shapes defined by polynomial equations, known as algebraic varieties. SGA introduced key concepts like schemes, sheaves, and cohomology, providing deep tools for understanding geometric structures through algebra. Its work laid the foundation for modern algebraic geometry, impacting how mathematicians analyze complex geometric objects using algebraic methods.