The file defines Cross class which calculate skeleton decomposition of matrix by Cross approximation algorithm describe for example in "A Parallel Implementation of the Matrix Cross Approximation Method" D. A. Zheltkov and E. E. Tyrtyshnikov, 2015, https://www.mathnet.ru/vmp548.
Definition in file cross.hpp.
#include "matrix.hpp"
#include "skeleton.hpp"
#include "indexlist.hpp"
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