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# Knot operation

In knot theory, a knot move or operation is a change or changes which preserve crossing number.[1] Operations are used to investigate whether knots are equivalent, prime or reduced.

Knot moves or operations include the flype, Habiro move, Markov moves (I. conjugation and II. stabilization), pass move, Perko move, and Reidemeister moves (I. twist move, II. poke move, and III. slide move).[1]

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• Surgeon's Knot: One-Handed Technique

#### Transcription

I'm now going to demonstrate the surgeon's knot using a one-hand technique I would caution you that in practice, in general, you will be using a two-hand technique to construct surgeon's knots but there are two different ways to construct a surgeon's knot using a one-hand technique and it depends solely on which throw of the one-hand technique that you're going to begin with. So I'm going to demonstrate one way and then I'll demonstrate the other. First, I'm going to feed the suture material around the tubing in this way and I'm going to grab the suture with my index finger and thumb in my right and so this is a surgeon's knot constructed using a one-hand technique using, creating it with my right hand. What I'll do is I'll create the half a loop and then I'm going to go around my two fingers twice. Now this becomes somewhat cumbersome because as you trap that end of the suture and go back through oftentimes you get stuck, like that. So that's why this is probably not the best technique but we'll try it again and I'm going to grab that and try to go through and eventually maneuver myself to the other the other side or halfway through the suture. Okay, then I'm just gonna simply - I've used the surgeon's throw - a simple throw and now I've completed the surgeon's knot using a one-hand technique. There's a second way to construct a surgeon's knot using a one-hand technique that might be a bit simpler than the previous one that I demonstrated. This time I'm going to feed the suture material around the tubing underneath and around and toward me such as this. Now I have this the short end of the suture material between my thumb and middle finger in my right hand so I'm going to construct this knot using a one-hand technique leading or using my right hand. I'm simply going to go around. This would be a simple square knot and then go back through again, twice. Now I've instructed a surgeon's throw. I lay that down and now I just finish the knot using a simple throw and I have my surgeon's knot created using a one-hand technique in a different fashion than I demonstrated before.