Mathematics – Number Theory

Scientific paper

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2011-10-22

Mathematics

Number Theory

Scientific paper

Let $(P,\preceq)$ be a lattice, $S$ a finite subset of $P$ and $f_1,f_2,...,f_n$ complex-valued functions on $P$. We define row-adjusted meet and join matrices on $S$ by $(S)_{f_1,...,f_n}=(f_i(x_i\wedge x_j))$ and $[S]_{f_1,...,f_n}=(f_i(x_i\vee x_j))$. In this paper we determine the structure of the matrix $(S)_{f_1,...,f_n}$ in general case and in the case when the set $S$ is meet closed we give bounds for $\text{rank} (S)_{f_1,...,f_n}$ and present expressions for $\det (S)_{f_1,...,f_n}$ and $(S)_{f_1,...,f_n}^{-1}$. The same is carried out dually for row-adjusted join matrix of a join closed set $S$.

**Haukkanen Pentti**

Mathematics – Combinatorics

Scientist

**Mattila Mika**

Mathematics – Number Theory

Scientist

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