Formalize section 4.1, proving π₃(S²) ≃ ℤ #35
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\pi_2(S^2) = \mathbb{Z}
)\pi_n(S^3) = \pi_n(S^2)
)\pi_n(S^n) = \mathbb{Z}
)\pi_3(S^2) = \mathbb{Z}
)Formalize section 4.1, proving pi_3(S^2) = Zto Formalize section 4.1, proving π₃(S²) ≃ ℤ