$\int_M \ f^* \Omega = (deg f) \int_N \Omega$
acceptable solution -
Whitney number $W(\gamma )$ is equal to either deg f - 1 or deg f + 1
"I would like to continue. question : what is a Hopf fibration?"
fiber $S^3$ - Hopf fibration
fun -
what is a one sided surface?
Möbius strip in $\mathbb{R}^3$
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