| http://www.w3.org/ns/prov#value | - This also works when you are trying to find your function $f$ explicitly when the three vectors you have are a basis: try to write $(1,0,0)$, $(0,1,0)$, and $(0,0,1)$ as linear combinations of the three vectors (this amounts to solving three systems of three linear equations with three unknowns first; or to finding the inverse of a matrix; so it looks like the same amount of work, but because ther
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