| http://www.w3.org/ns/prov#value | - Another example is a matrix where the rows are the characteristic vectors of all intervals in {1 ... n}; in this case, the set { $Bu: \mbox{u is k-sparse}$} contains all $k$-histograms", i.e., piecewise constant functions over {1 ... n} with at most $k$ pieces.
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