Section 22. The Quotient Topology - East Tennessee State ...
May 01, 2015 · 22. The Quotient Topology 3 Example 22.2. Let π1: R×R → R be projection onto the first coordinate.Then π1 is continuous and surjective. For any open set O ⊆ R × R, O is the countable union of basis elements of the form U ×V.
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