3-fold
Encyclopedia
In algebraic geometry
, a 3-fold or threefold is a 3-dimensional algebraic variety
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The Mori program showed that 3-folds have minimal models.
Algebraic geometry
Algebraic geometry is a branch of mathematics which combines techniques of abstract algebra, especially commutative algebra, with the language and the problems of geometry. It occupies a central place in modern mathematics and has multiple conceptual connections with such diverse fields as complex...
, a 3-fold or threefold is a 3-dimensional algebraic variety
Algebraic variety
In mathematics, an algebraic variety is the set of solutions of a system of polynomial equations. Algebraic varieties are one of the central objects of study in algebraic geometry...
.
The Mori program showed that 3-folds have minimal models.