John N. Mather
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John Norman Mather was a mathematician at Princeton University known for his work on singularity theory and Hamiltonian dynamics.
Mather at Oberwolfach in 2005
Topology
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Topology is the branch of mathematics concerned with the properties of a geometric object that are preserved under continuous deformations, such as stretching, twisting, crumpling, and bending; that i
Möbius strips, which have only one surface and one edge, are a kind of object studied in topology.
A continuous transformation can turn a coffee mug into a donut. Ceramic model by Keenan Crane and Henry Segerman.