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16 hours ago history edited YCor CC BY-SA 4.0
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16 hours ago comment added Willie Wong Note also that any (reasonably nice) map from $\mathbb{R}^2$ or $\mathbb{S}^2$ to $\mathbb{S}^n$ with $n > 2$ is homotopic to the constant map, so you cannot expect stability.
16 hours ago comment added Willie Wong What are you imagining as the correct generalization of topological degree for mappings between manifolds of unequal dimension?
16 hours ago history asked Student CC BY-SA 4.0