Wiktionary
differential topology
n. (context mathematics English) Field dealing with differentiable functions on differentiable manifolds.
Wikipedia
Differential topology
In mathematics, differential topology is the field dealing with differentiable functions on differentiable manifolds. It is closely related to differential geometry and together they make up the geometric theory of differentiable manifolds.
Usage examples of "differential topology".
It was still at the eighth setting, the peculiar, twisted shape that Nessus had compared to a diagram from differential topology.