Knot Theory Diagrams A and B - Topological Comparisons in Mathematical Illustration #2003451 (License: Personal Use)

Diagram A features a left-handed crossing where the upper loop passes over the lower at the center, while Diagram B shows a right-handed crossing with opposite strand orientation. Both are simple closed curves intersecting twice, commonly used to illustrate Reidemeister moves or chirality in knot theory. The hand-drawn style suggests pedagogical or research sketch usage.

This image is typically used in mathematics education, particularly in topology or knot theory courses, to demonstrate how small changes in crossing direction affect knot classification. It matches user intent for visual explanation of non-equivalent knots or teaching Reidemeister moves.