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5. Let ф: S1 S2 be a diffeomorphism. a. Show that S is orientable if and only if S2 is orientable (thus, orientability is pre(cf. Exercise 4) from the initial one (thus, orientation itself may not be preserved by diffeomorphisms; note, however; that

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5. Let ф: S1 S2 be a diffeomorphism. a. Show that S is orientable if and...
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