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math.GT2019★ 1 cited
Quandle colorings vs. biquandle colorings
Katsumi Ishikawa, Kokoro Tanaka
Biquandles are generalizations of quandles. As well as quandles, biquandles give us many invariants for oriented classical/virtual/surface links. Some invariants derived from biqua…
math.GT2019
Minimal coloring numbers on minimal diagrams of torus links
Kazuhiro Ichihara, Katsumi Ishikawa, Eri Matsudo
We determine the minimal number of colors for non-trivial -colorings on the standard minimal diagrams of -colorable torus links. Also included are complete…