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isl (integer set library) is a portable C library for manipulating sets and relations of integer points bounded by linear constraints.The following operations are supported: intersection, union, set difference emptiness check convex hull (integer) affine hull integer projection computing the lexicographic minimum using parametric integer programming coalescing parametric vertex enumerationIt also includes an ILP solver based on generalized basis reduction, transitive closures on maps (which may encode infinite graphs), dependence analysis and bounds on piecewise step-polynomials.All computations are performed in exact integer arithmetic using GMP or imath.Many program analysis techniques are based on integer set manipulations.