نتایج جستجو برای: dowling
تعداد نتایج: 557 فیلتر نتایج به سال:
We study complex hyperplane arrangements whose intersection lattices, known as the Dowling lattices, are a natural generalization of the partition lattice. We give a combinatorial description of the Dowling lattice via enriched partitions to obtain an explicit EL-labeling and then find a recursion for the flag h-vector in terms of weighted derivations. When the hyperplane arrangements are real ...
We define the Dowling transform of a real frame arrangement and show how the characteristic polynomial changes under this transformation. As a special case, the Dowling transform sends the braid arrangement An to the Dowling arrangement. Using Zaslavsky's characterization of supersolvability of signed graphs, we show supersolvability of an arrangement is preserved under the Dowling transform. W...
Abstract The notions of r -Bell polynomials and their generalization, the -Dowling are due to Mező Cheon, Jung. Recently, Nyul Rácz defined -Lah polynomials, which close relatives polynomials. In present paper, we introduce Dowling type generalization -Dowling–Lah We give a comprehensive study them using results author on -Whitney–Lah numbers, coefficients these
Degenerate Dowling and degenerate r-Dowling polynomials were introduced earlier as versions further generalizations of polynomials. The aim this paper is to show their connections with Poisson central moments for a random variable certain parameter Charlier
Association of Dowling-Degos disease and multiple seborrheick-eratosis in a “Christmas tree pattern”
Dowling-Degos disease is a rare sporadic or autosomal dominant pigmentary entity, in which clusters of papules and reticulate macules slowly develop with predominance in flexural regions. This entity is due to mutations in the keratin 5 gene, and is related with other cutaneous disorders. We report the sporadic form of Dowling-Degos disease in an elderly man with multiple seborrheickeratosis ...
In this paper, we study some properties of Whitney numbers of Dowling lattices and related polynomials. We answer the following question: there is a relation between Stirling and Eulerian polynomials. Can we find a new relation between Dowling polynomials and other polynomials generalizing Eulerian polynomials? In addition, some congruences for the Dowling numbers are given. Mathematics Subject...
Our main result describes how to extend a matroid so that its ground set is a modular hyperplane of the larger matroid. This result yields a new way to view Dowling lattices and new results about line-closed geometries. We complement these topics by showing that line-closure gives simple geometric proofs of the (mostly known) basic results about Dowling lattices. We pursue the topic of line-clo...
Dowling –Degos disease is a rare condition. It is inherited by an autosomal dominant gene. It usually presents in adult life as small, pigmented, asymptomatic macules in flexural regions. We report a 35-year-old woman with Dowling- Degos disease, in whom the reticular pigmentation confined to the genital area.
association of dowling-degos disease and multiple seborrheick-eratosis in a “christmas tree pattern”
dowling-degos disease is a rare sporadic or autosomal dominant pigmentary entity, in which clusters of papules and reticulate macules slowly develop with predominance in flexural regions. this entity is due to mutations in the keratin 5 gene, and is related with other cutaneous disorders. we report the sporadic form of dowling-degos disease in an elderly man with multiple seborrheickeratosis in...
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