Hyperbolic Sine - Exponent transition • Physics Forums

porcupineman23 · 2014-02-12T19:42:18+00:00

Hey I didn't understand the transition below, I'd be glad for some help thanks

Thread '2-sphere intrinsic definition by gluing disks' boundaries'

A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.

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Hyperbolic Sine - Exponent transition

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