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math.CO2021
On the Asymmetric Generalizations of Two Extremal Questions on Friends-and-Strangers Graphs
Kiril Bangachev
For two graphs and with vertex sets and of the same cardinality the friends-and-strangers graph was recently defined by Defant and Kra…
math.CO2018
Enumerative and Structural Aspects Of Anagrams Without Fixed Letters
Kiril Bangachev
For the word denote by the number of its anag…