Báo cáo tin học: "Small integral trees" doc

... 05E99 Abstract We give a table with all integral trees on at most 50 vertices, and characterize integral trees with a single eigenvalue 0. 1 Integral trees A finite graph is called integral if the spectrum of ... the smallest integral trees of diameter 6, and the smallest known integral tree of diameter 8. The nicest result about integral trees is that by Watanabe [12] that says...

Ngày tải lên: 07/08/2014, 15:23

Ngày tải lên: 07/08/2014, 05:23

... columns in order to have the resulting matrix to be simple. If we wish to remove row i, then we can force the resulting (m − 1)-rowed matrix to be simple by deleting the columns associated with ... Deletion Lemma 1.6. If we wish to remove row i , then we can force the resulting (m − 1)-rowed matrix to be simple by deleting the columns associated with e and b and (c or d) and (a or f). Thus, a...

Ngày tải lên: 07/08/2014, 15:23

... of bracketing information are available. Human inspection and correction can provide those boundaries, but the amount of manual work can be reduced significantly if there is an existing source ... Ontario, Canada. 904 the bracketing information is also used to rank trees in cases where more than one tree is generated. 3.1 Brackets as rule conditions Bracketing information is used i...

Ngày tải lên: 08/03/2014, 02:21

... heat shock protein, with actin: role in modulating actin fila- ment dynamics in vivo. J Mol Biol 366, 756–767. 29 Wang K & Spector A (1996) a-Crystallin stabilizes actin filaments and prevents ... polar F-actin filaments. Different types of stress, e.g. heat shock, can induce actin unfolding, leading to disruption of actin filaments and aggregation of fully or partially dena- tured actin [1,2...

Ngày tải lên: 16/03/2014, 06:20

... does not contain any edge (n, i). Moreover, if (i, n), (n, j) ∈ Y for some distinct i, j, then the edge (i, j)isaconepointinΣ Y ; we already have a directed path from i to j via n. The remaining ... We will refer to complexes admitting F-optimal acyclic matchings as semi-collapsible complexes, aligning with the fact that collapsible complexes are those admitting a perfect acyclic match- ing....

Ngày tải lên: 07/08/2014, 08:22

... G  by first deleting from G all edges emanating from z which are sent to vertices in Z ∪ F. In turn we add enough edges so that y is adjacent to each vertex in Z ∪ F. This amounts to “transplanting” each ... T  for a dominating set M  of G with order at most b − 1. Thus T  is the required trunk and we are finished. First, though, we construct a spanning tree T for a somewhat larger dominati...

Ngày tải lên: 07/08/2014, 15:23

... 27 alternating sign matrices and such osculating paths is also considered in [14, Sec. 5], [15, Sec. 2], [31, Sec. 9] and [66, Sec. IV]. 5. Further Representations of Higher Spin Alternating Sign ... for standard alternating sign matrices (see for example [22, 33, 47]). In these cases, vertex type (4) in Figure 3 (which corresponds to each entry of −1 in a standard alternating sign matrix) .....

Ngày tải lên: 07/08/2014, 15:23

... a Laplacian integral graph. One of the interesting challenges in dealing with Laplacian integral graphs is that of describing, constructing, and understanding families of Laplacian integral graphs ... is Laplacian integral if and only if it is one of the graphs depicted in Figures 4 and 5. Proof: It is straightforward to determine that each of the graphs in Figures 4 and 5 is Laplacia...

Ngày tải lên: 07/08/2014, 21:20

... enolase. Authors’ contributions All authors contributed the same. Competing interests The authors declare that they have no competing interests. Received: 29 June 2010 Accepted: 18 November 2010 Published: ... Small cell neuroendocrine carcinoma of the rectum associated with chronic ulcerative colitis. Histopathology 1990, 16(1):95-7. 9. Wick MR, Weatherby RP, Weiland LH: Small cell neuroendo...

Ngày tải lên: 09/08/2014, 03:23