Mathematical Contributions
His contributions include a proof of the Smale conjecture for the 3-sphere and important results in the theory of pseudoisotopy, k-theory, surfaces and 3-manifolds.
Read more about this topic: Allen Hatcher
Famous quotes containing the word mathematical:
“It is by a mathematical point only that we are wise, as the sailor or the fugitive slave keeps the polestar in his eye; but that is sufficient guidance for all our life. We may not arrive at our port within a calculable period, but we would preserve the true course.”
—Henry David Thoreau (1817–1862)
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