i = isStrictSperner P
The ranked poset $P$ is strict Sperner if the maximalAntichains are the sets of elements with the same rank.
The $n$ chain is strict Sperner as the maximal antichains and the sets of elements with the same rank are singletons.
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The $n$ booleanLattice, for $n \geq 3$, is not strict Sperner as it has maximal antichains which are not sets of elements with the same rank.
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The object isStrictSperner is a method function.