Shortest Basis Problem
Many problems become easier if the input basis consists of short vectors. An algorithm that solves the Shortest Basis Problem (SBP) must, given a lattice basis, output an equivalent basis such that the length of the longest vector in is as short as possible.
The approximation version problem consist of finding a basis whose longest vector is at most times longer than the longest vector in the shortest basis.
Read more about this topic: Lattice Problem
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