A tangent flow at a singular space-time point 
of mean curvature
flow is a limit of parabolically dilated flows about that point.
For a positive dilation factor 
, write
 |
where 
describes times before the singularity. A tangent flow is obtained along a sequence
when a limit exists in
the specified topology. Its center and spatial axes are fixed by this rescaling.
Uniqueness asserts independence of the sequence.
