- #1
Leeway
- 2
- 0
Hey all , I would need help about how to solve the problems in chapters 9 and 10 of Geometry Topology and Physics, Nakahara. 1. Why the Whitney sum of 2 Mobium Strips is a trivial bundle - I found the transition matrices to be the identity, -identity . SO not all of them are identity -> the bundle is not trivial as it has to be. 2. I have a volume element Omega_n of S^n normalized as integral(Omega_n) = 1. Let f be a smooth map : S^2n-1 to S^n and consider the pullback f^*Omega_n. Show that the pullback is closed and written as d(omega_n-1), where omega_n-1 is a n-1 form on S^2n-1. Then show that the Hopf invariant H(f)=Integral{(omega_n-1) /\ d(omega_n-1) } is independent of the choise of omega_n-1. Please help me I will appreciate it very much ! PS: If you knew the solution of the Berry`s phase in chapter 10 pls let me know also .. ;o) Have a nice day.