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Section 18. Continuous Functions

18. Continuous Functions1 Section isthefundamental concept in topology! When you hear that a coffee cup and a doughnut are topologically equivalent, this is really a claimabout the existence of a certain Continuous function (this idea is explored in depthin Chapter 12, Classification of Surfaces ). We start by reviewing some continuityideas from Analysis 1 (MATH 4217/5217). standard definition of continuity of a real valued function of a realvariable at a pointx0in the domain of the functionf,D(f), is as follows ( , page 2) a function andx0 D(f). Thenfiscontin-uous at pointx0iffor all >0 there exits ( )>0 such thatfor all|x x0|< ( ) andx D(f) we have|f(x) f(x0)|<.

Jun 11, 2016 · 18. Continuous Functions 1 Section 18. Continuous Functions Note. Continuity is the fundamental concept in topology! When you hear that “a coffee cup and a doughnut are topologically equivalent,” this is really a claim about the existence of a certain continuous function (this idea is explored in depth in Chapter 12, “Classification of ...

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Transcription of Section 18. Continuous Functions

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