Does there exist a regular simple closed curve on a compact surface which cuts the surface into two regions, each with total Gaussian curvature of 2π? Select one: O a. Yes, and an example is given by a circle on a torus of revolution obtained by rotating this circle about an axis. O b. Yes, and an example is given by the equator on the unit sphere. O c. Yes, and an example is given by the unit circle defined by z = 0 on the hyperboloid of one sheet x² + y² − z² = 1. O d. No, by the Jordan curve theorem. O e. No, by Hopf's Umlaufsatz. O f. No, by Fenchel's theorem. Og. No, by the isoperimetric inequality. Oh. No, by Green's theorem. O i. No, by the four vertex theorem. O j. No, by Gauss' Theorema Egregium. Ok. No, by the Gauss-Bonnet theorem.

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Author:Erwin Kreyszig
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Does there exist a regular simple closed curve on a compact surface which cuts the surface into two regions, each with total Gaussian curvature of
2π ?
Select one:
O a. Yes, and an example is given by a circle on a torus of revolution obtained by rotating this circle about an axis.
b.
Yes, and an example is given by the equator on the unit sphere.
O c.
Yes, and an example is given by the unit circle defined by z = 0 on the hyperboloid of one sheet x² + y² − z² = 1.
d.
No, by the Jordan curve theorem.
e.
O f.
g.
No, by Hopf's Umlaufsatz.
No, by Fenchel's theorem.
No, by the isoperimetric inequality.
Oh. No, by Green's theorem.
O i.
O j.
Ok.
No, by the four vertex theorem.
No, by Gauss' Theorema Egregium.
No, by the Gauss-Bonnet theorem.
Transcribed Image Text:Does there exist a regular simple closed curve on a compact surface which cuts the surface into two regions, each with total Gaussian curvature of 2π ? Select one: O a. Yes, and an example is given by a circle on a torus of revolution obtained by rotating this circle about an axis. b. Yes, and an example is given by the equator on the unit sphere. O c. Yes, and an example is given by the unit circle defined by z = 0 on the hyperboloid of one sheet x² + y² − z² = 1. d. No, by the Jordan curve theorem. e. O f. g. No, by Hopf's Umlaufsatz. No, by Fenchel's theorem. No, by the isoperimetric inequality. Oh. No, by Green's theorem. O i. O j. Ok. No, by the four vertex theorem. No, by Gauss' Theorema Egregium. No, by the Gauss-Bonnet theorem.
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