I'm having trouble understanding the homomorphisms $\pi_1g(S^2)\longrightarrow \pi_1 M^4$ where $g: S^2\longrightarrow M^4$ can be a framed or unframed immersion.
Any reference on this?
2026-03-26 14:29:01.1774535341
Sphere immersions in 4-manifolds
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