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# トポロジーセミナー（2017/09/21）

In particular, some invariants from biquandles are known to be stronger than those from quandles for virtual links.

In this talk, we first explain that, for any classical/surface link, we can recover (a biquandle isomorphic to) the fundamental biquandle from the fundamental quandle.
This result implies that many biquandle invariants are reduced to quandle ones.
In fact, a biquandle coloring number is equal to a quandle coloring number.
Furthermore, we give an explicit one-to-one correspondence between biquandle colorings and quandle colorings.
As a corollary, a biquandle cocycle invariant is described by a quandle shadow cocycle invariant.

This is a joint work with Kokoro Tanaka (Tokyo Gakugei University).