How supposed I imagine the following equations?

What is SUBSET on “open subset of R[tex]^{n}[/tex]"?
How supposed I imagine the following equations?

u : UR
 
611
1
it's the same as any other subset.

U is a subset of P if

for all x in U x is also in P.

So what does it mean to be an element of an open set of R^n?

u is probably a function.

It assigns each element in U to one element in R
 

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