کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9513242 1632460 2005 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Counting embeddings of a chain into a tree
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات ریاضیات گسسته و ترکیبات
پیش نمایش صفحه اول مقاله
Counting embeddings of a chain into a tree
چکیده انگلیسی
For a given finite poset T whose Hasse diagram is a tree and its maximal element is its root, we compare the number of those embeddings into T of a chain of a given length which contain the maximal element of T and the number of those embeddings which do not contain the maximal element of T. For a given positive integer k, we establish average depth thresholds for T beyond which there are always more embeddings of the second kind than those of the first one. We, actually, give a better than 1 upper bound for the ratio between the numbers of these embeddings that depends on the structure of T.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Discrete Mathematics - Volume 297, Issues 1–3, 28 July 2005, Pages 49-59
نویسندگان
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