Type I arc crossing change unknots every link diagram; type II leaves a Hopf link residue when the total linking number is odd, and any two crossings in an alternating knot diagram can be switched.
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When is arc crossing change an unknotting operation?
Type I arc crossing change unknots every link diagram; type II leaves a Hopf link residue when the total linking number is odd, and any two crossings in an alternating knot diagram can be switched.