Questions tagged [virtual-knots]
The virtual-knots tag has no usage guidance.
1
question
9
votes
1
answer
1k
views
Diagrammatic proof of unique prime decomposition of knots
Consider a knot to be a diagram in a plane--- i.e. a drawing of a finite connected planar graph (loops and multiple edges allowed) whose vertices are 4-valent with cyclic ordering for the incident ...