Define a map тар p: x → (0,0) x Sl p(x,y) = (r, eid) : where 8 = x² + y² and 0 = tant: if x3,0, 83,0 π- tan¹ || : -tań los el tant 1x 1-5 T : if as if x <0, y > 0 x>0, xo ie TER GLO

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 39RE
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Let
x =
Define a map pix → (0,0) x Sl
p(x, y) = (r, eio)
where 8 = 2²+y? and
R²-{(0,0)} with usual topology.
Thus
0 =
tan' :if x30, 83,0
as
π- tan' || : if x <0, y >o
-tan´¹ || : if x>0, *<
tan¹ | 21-T if x<0, *<o
Then clearly pis
homeomorphism.
And as
we know
q: (0,00)xs's'XR
q (x, y) = (y, logy) is homeomorphism.
[= log: (0,00) + IR is homeomorphism]
qop: x s'X R is a
homeomorphism.
=) R² - { [0,0]} is homeomorphic to s'XIR.
Transcribed Image Text:Let x = Define a map pix → (0,0) x Sl p(x, y) = (r, eio) where 8 = 2²+y? and R²-{(0,0)} with usual topology. Thus 0 = tan' :if x30, 83,0 as π- tan' || : if x <0, y >o -tan´¹ || : if x>0, *< tan¹ | 21-T if x<0, *<o Then clearly pis homeomorphism. And as we know q: (0,00)xs's'XR q (x, y) = (y, logy) is homeomorphism. [= log: (0,00) + IR is homeomorphism] qop: x s'X R is a homeomorphism. =) R² - { [0,0]} is homeomorphic to s'XIR.
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