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arXiv · 2412.03627

Counting of lattices containing up to four comparable reducible elements and having nullity up to three

B. P. Aware·A. N. Bhavale
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Abstract

In 2020 Bhavale and Waphare introduced the concept of a nullity of a poset as nullity of its cover graph. According to Bhavale and Waphare, if a dismantlable lattice of nullity k contains r reducible elements then 2 $\leq$ r $\leq$ 2k. In 2003 Pawar and Waphare counted all non-isomorphic lattices with equal number of elements and edges, which are precisely the lattices of nullity one. Recently, Bhavale and Aware counted all non-isomorphic lattices on n elements having nullity up to two. Bhavale and Aware also counted all non-isomorphic lattices on n elements, containing up to three reducible elements, having nullity k $\geq$ 2. In this paper, we count up to isomorphism the class of all lattices on n elements containing four comparable reducible elements, and having nullity three.

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B. P. Aware, A. N. Bhavale. 2025-03-15. Counting of lattices containing up to four comparable reducible elements and having nullity up to three. https://arxiv.org/abs/2412.03627

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