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Let U R2 be an open set. If f : R2 R is the projection function, f(x,y) = x. Show that f(U) = {f(x, y)|
Let U R2 be an open set. If f : R2 R is the projection function, f(x,y) = x. Show that f(U) = {f(x, y)| (x, y) U} is an open subset of R.
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Set-Theoretic Topology
Authors: George M Reed
1st Edition
1483263924, 9781483263922
