Manifolds, Transversality, and de Rham Cohomology by Peter Petersen (source code)

= Manifolds, Transversality, and de Rham Cohomology by Peter Petersen
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Author-hosted text: https://www.math.ucla.edu/~petersen/manifolds.pdf

Cited passage: section3.3, Theorem3.3.4 (Ehresmann), printed pages63–64 in the current author-hosted version. No publication date is inferred.