Extending immersed circles in the sphere to immersed disks in the ball.
Heron's Formula from a 4-Dimensional Perspective
Homology theory for the set-theoretic Yang-Baxter equation and knot invariants from generalizations of quandles
A homology theory is developed for set-theoretic Yang-Baxter equations, and knot invariants are constructed by generalized colorings by biquandles and Yang-Baxter cocycles.
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