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Restricted partitions and convex topologies
AIMS Mathematics 2025, 10(4): 10187-10203
Published: 15 April 2025
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Let X n be a finite set. We consider two types of sequences of restricted partitions of X n , namely, the number of order consecutive partitions of X n into k parts, denoted N o c ( n , k ) and the sequence T ( n , k ) of the number of order-consecutive partition sequences of X n with k parts. This last sequence is also the number of locally convex topologies consisting of k nested open sets defined on a totally ordered set of cardinality n. Although all the main results apply to both sequences, we will focus on T ( n , k ). We prove that the generating polynomials of these sequences have real negative roots. A central limit theorem and a local limit theorem are also proved for T ( n , k ). Many other relations with Fibonacci and Lucas numbers are also given.

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