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Class 9 Homework-

Let X:=[0,1]×[0,1] (Unit Square) and let Y=T×T (Torus). Verify the following:

(1) If s1s2=±1 then define (s1,t1)(s2,t2) iff t1=t2. If t1t2=±1 then define (s1,t1)(s2,t2) iff s1=s2. If (s1,t1),(s2,t2)[0,1]×[0,1] then (s1,t1)(s2,t2) provided s1=s2 and t1=t2. Then  defines an equivalence relation on X.

(2) f:XY given by f(s,t)=(e2πis,e2πit) is a continuous surjection. Conclude that X/ and Y are homeomorphic.




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