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A break in a line showing which passes under.
Also known as: Over-under crossing, Knot crossing convention
The topological notation showing at a crossing which strand passes over and which under.
Shows which strand passes over the other at a crossing in a knot diagram.
Contexts: Mathematics
The gap carries the entire three-dimensional information in a two-dimensional drawing, so a knot diagram is a projection with exactly one bit restored at each crossing — the minimum needed to reconstruct the knot.
Contexts: Mathematics
Two lines crossing, the under-strand drawn with a short gap either side of the crossing so the over-strand appears continuous.