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Dimension jump in a smooth family of manifolds

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Differential geometry
2026-10-03  0 By others on same topic  0 Discussions Create my own version
Smoothness of every fibre in a parameterized family does not force their dimensions or tangent spaces to vary continuously with the parameter. A dimension jump can produce convergent tangent vectors whose limit is not tangent to the limiting fibre.

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  • Past exam of the mathematics course of the University of Cambridge / 2018 / ii / Paper 1 / 26I / d / Solution

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