Computational Topology Counterexamples with 3D Visualization of Bezier Curves

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For applications in computing, Bezier curves are pervasive and are defined by a piecewise linear curve L which is embedded in R³ and yields a smooth polynomial curve C embedded in R³. It is of interest to understand when L and C have the same embeddings. One class of counterexamples is shown for L being unknotted, while C is knotted. Another class of counterexamples is created where L is equilateral and simple, while C is self-intersecting. These counterexamples were discovered using curve visualizing software and numerical algorithms that produce general procedures to create more examples.