| http://www.w3.org/ns/prov#value | - Further to your example of $x^n$, you could consider $\mathrm{e}^x$ as interpolating the volume of a box with sides of length $\mathrm{e}$ in $x$-dimensional space for non-integer dimensions $x$ -- but something tells me that might not be the sort of thing you are looking for :-)
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