In
algebraic geometry, a 3-fold or threefold is a 3-dimensional
algebraic variety
Algebraic varieties are the central objects of study in algebraic geometry, a sub-field of mathematics. Classically, an algebraic variety is defined as the set of solutions of a system of polynomial equations over the real or complex numbers. ...
.
The
Mori program showed that 3-folds have minimal models.
References
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