- #1
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Homework Statement
An example of a function that is open but not closed, and an example of a function that is closed but not open.
Homework Equations
The function f is open (closed) if f[A] is open (closed) for each open (closed) set A in X.
The Attempt at a Solution
This is a topology question and I don't understand it. The only attempt I have made was to guess at a function with < instead of =. If somebody could clarify on the point of what these "functions" look like. Are they the standard, f(x) = x^2 type, or something else?