Thus $X$ can be taken as coordinate variable on $M$.
If one thinks of $x, y$ as space variables and of $z$ as time, then ......
a function of several variables [Not: “of many variables”]
Thorin discovered the complex-variable proof of Riesz's theorem.
A homogeneous two-variable function $f$ can be reduced to a one-variable function $F(x)=f(1,x)$.
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