a) Show that 2u 2v u? + v² – 1 Pn(u, v) = %3D u² + v² + 1' u² + v² + 1' u² + v² +1 -u? – v? + 1. u² + v² + 1'u² + v² + 1’ u² + v² + 1 2u 2v p.(u, v) = ( In particular, they are smooth maps. b) Show that p, and p, are regular surface patches. (Hint: to save time, calculate the dot product instead of the cross product!).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let S? = {(r, y, z) : x² + y² + z² = 1} be the unit sphere and let n = (0,0, 1)
and s = (0,0, –1). Let U, = S²\{n}, U, = S²\{s} and let R? = R\{(0,0)}.
We define a map Pn : R² → R³ called the stereographic projection to be the
map that assigns to (u, v) E R² the point of intersection of the straight line
through (u, v, 0) and n with the sphere S?. We define the map p, in a similar
way by changing n by s.
a) Show that
2u
2v
u? + v² – 1,
Pn(u, v) = (
u² + v² + 1°u² + v² + 1°u² + v² +1
=
2u
2v
-u? – v² + 1
P.(u, v) = (-
u² + v² + 1' u² + v² + 1’ u² + v² +1
In particular, they are smooth maps.
b) Show that p, and p, are regular surface patches. (Hint: to save time,
calculate the dot product instead of the cross product!).
Transcribed Image Text:Let S? = {(r, y, z) : x² + y² + z² = 1} be the unit sphere and let n = (0,0, 1) and s = (0,0, –1). Let U, = S²\{n}, U, = S²\{s} and let R? = R\{(0,0)}. We define a map Pn : R² → R³ called the stereographic projection to be the map that assigns to (u, v) E R² the point of intersection of the straight line through (u, v, 0) and n with the sphere S?. We define the map p, in a similar way by changing n by s. a) Show that 2u 2v u? + v² – 1, Pn(u, v) = ( u² + v² + 1°u² + v² + 1°u² + v² +1 = 2u 2v -u? – v² + 1 P.(u, v) = (- u² + v² + 1' u² + v² + 1’ u² + v² +1 In particular, they are smooth maps. b) Show that p, and p, are regular surface patches. (Hint: to save time, calculate the dot product instead of the cross product!).
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