| http://www.w3.org/ns/prov#value | - In Mathematica there is no such thing as a row vector and columns vector: a vector is a strictly 1D structure and both the product vec.mat and mat.vec work. (You can of course have an $1 imes n$ or $n imes 1$ matrix.) Operations between $m imes k$ matrices and $m$-length vectors do work automatically, but not with $k$-length vectors.
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