Minimal unknotting sequences of Reidemeister moves containing unmatched RII moves

Chuichiro Hayashi, Miwa Hayashi, Minori Sawada +1

Arnold introduced invariants $J^{+}$, $J^{-}$ and $St$ for generic planar curves. It is known that both $J^{+}/2+St$ and $J^{-}/2+St$ are invariants for generic spherical curves. App…