##  [Crease](/crease) 

  ##  [Crease](https://puremath.quantumdictionary.io/crease-0) 

  

 [![Pure Mathematics Dictionary](/sites/default/files/styles/large/public/2026-01/Pure%20Mathematics.png.webp?itok=5pZnFQ59)](/topic-specific-dictionaries/mathematics-logic/pure-mathematics)

- Mathematics & Logic -

**Pure Mathematics Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A curve on a surface along which the surface remains continuous but the tangent plane (or first derivative) has a discontinuity across the curve, producing a fold or sharp change in slope while the positional map is continuous.