3. Using the definition of open sets, prove that an interval (0, a) is open where a > 0 is an arbitrary positive number.

Elementary Geometry For College Students, 7e
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Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
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Chapter1: Line And Angle Relationships
Section1.4: Relationships: Perpendicular Lines
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3. Using the definition of open sets, prove that an interval (0, a) is open where a > 0 is an
arbitrary positive number.
Transcribed Image Text:3. Using the definition of open sets, prove that an interval (0, a) is open where a > 0 is an arbitrary positive number.
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