Pretzel links, mutation, and the slice-ribbon conjecture

  title={Pretzel links, mutation, and the slice-ribbon conjecture},
  author={Paolo Aceto and Min Hoon Kim and Junghwan Park and Arunima Ray},
  journal={Mathematical Research Letters},
Let p and q be distinct integers greater than one. We show that the 2-component pretzel link P(p,q,-p,-q) is not slice, even though it has a ribbon mutant, by using 3-fold branched covers and an obstruction based on Donaldson's diagonalization theorem. Combining this result with previous work of the first author we prove the slice-ribbon conjecture for 4-stranded 2-component pretzel links. 
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