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{\bf William Y.C. Chen and Jessica C.Y. Zhang}
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{\bf The Skew and Relative Derangements of Type $B$}
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By introducing the notion of relative derangements of type $B$, also
called signed relative derangements, which are defined in terms of
signed permutations, we obtain a type $B$ analogue of the well-known
relation between the relative derangements and the classical
derangements. While this fact can be proved by using the principle
of inclusion and exclusion, we present a combinatorial
interpretation with the aid of the intermediate structure of signed
skew derangements.
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