A sharp point on a curve. A point on a curve with two tangents. A point on a curve where the second derivative is discontinuous.
None of these definitions mathematically is totally satisfactory however a proper definition can be found at:
http://en.wikipedia.org/wiki/Cusp (Singularity)
Links to this page /
Page history /
Last change to this page
Recent changes /
Edit this page (with sufficient authority)
All pages /
Search /
Change password /
Logout