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math.CO2023
The complex of injective words of permutations which are not derangements is contractible
Assaf Libman
Let be the set of derangements in the symmetric group. We prove that the complex of injective words generated by is contractible. This gives…
math.CO2020
Polytopes associated with lattices of subsets and maximising expectation of random variables
Assaf Libman
The present paper originated from a problem in Financial Mathematics concerned with calculating the value of a European call option based on multiple assets each following the bino…