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Intersection of closed geodesics on a positively curved sphere
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Mathematics
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Geometry and topology
Differential geometry
Gauss-Bonnet theorem
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Two disjoint simple closed curves on a sphere bound an annulus
A
. If both are geodesics, its boundary geodesic-curvature terms vanish, whereas
χ
(
A
)
=
0
. Gauss-Bonnet would give
∫
A
K
d
A
=
0
,
(94)
which is impossible when
K
>
0
everywhere.
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Gauss-Bonnet theorem
Differential geometry
Geometry and topology
Area of mathematics
Mathematics
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