In mathematics, and especially topology and differential geometry, a pinched torus (or croissant surface) is a kind of two-dimensional surface. It gets its name from its resemblance to a torus that has been pinched at a single point. A pinched torus is an example of an orientable, compact 2-dimensional pseudomanifold.[1]
- ^ Brasselet, J. P. (1996). "Intersection of Algebraic Cycles". Journal of Mathematical Sciences. 82 (5). Springer New York: 3625–3632. doi:10.1007/bf02362566.