Study shows equivariant unknotting number is not sub-additive under connected sum in strongly invertible knots, indicating new insights on knot theory.
We study symmetric crossing change operations for strongly invertible knots. Our main theorem is that the equivariant unknotting number is not sub‐additive under connected sum, in contrast with the usual unknotting number.
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Boyle et al. (2026) studied this question.
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