Thursday, January 13, 2022

Version 0.972a online!

A number of features have been added since the last post, including joint work with Brendan Owens on his algorithm for identifying ribbon disks for alternating knots and with Lucia Karageorghis on doubly-slice knots.

In addition a few small general features have been added (the to-do list remains quite long!):
  • As requested, the ability to clone a knot diagram into a Kirby diagram or surgery diagram has been added to the Convert menu, completing the loop with the ability to clone a knot diagram from either of these two.
  • Another useful knot manipulation, the Sweep move (also known as the "over" or "under" move), which allows a strand of knot (or band) that proceeds completely over or completely under at consecutive crossings to be freely moved (over or under, respectively) the rest of the diagram to any other position, which should allow for a little less repeated clicking to move bits of knot around via smaller moves.  This is illustrated in the brief video below: