Báo cáo toán học: "The Structure of Locally Finite Two-Connected Graphs" potx

... ,A k denote the bridges of the endpoints of e;thereare only finitely many of them, since G is locally finite. Then k ≥ 3 and one of the A i is the edge e itself. If A i consists of more than a single ... Invariance of T e Proposition 1 Let G be a locally finite 2-connected graph, and let e be an edge of G.IfT is any 3-block tree for G, then T = T e . Proof: We will show that th...

Ngày tải lên: 07/08/2014, 06:20

... upon. The example of a k-sum-free set A in [3], referred to in the proof of Lemma 3, satisfies |A| > k(k − 2) k 2 − 2 n + 8(k − 2) k(k 2 − 2)(k 4 − 2k 2 − 4) n − 3. Hence the proof of Lemma 3 goes ... shown that, as a function of s ∈ [1,n], the cardinality of A 3 attains its maximum only for some s ∈ [s  − 2k, s  + 2]. This, together with (8), completes the proof of the lemma....

Ngày tải lên: 07/08/2014, 08:22

... copy of H] → 1 as n → ∞. Sketch of Proof We work with the set of graphs that don’t have any copies of H. By Lemma 4, we may assume that we have lots of pendant edges, so we may delete |H| of these ... decent proportion of graphs with lots of isolated vertices, but no components isomorphic to C. If such a graph contains lots of copies of C, then we may ‘transfer’ the edges...

Ngày tải lên: 08/08/2014, 11:20

... combined to a complete structure of the carbohydrate backbone of the LPS from A. baumannii strain ATCC 19606 as depicted in Fig. 4. The structures o f four core regions from LPS of d ifferent Acinetobacter ... furnished ®rst in biosynthesis of t he core region, as found e.g. i n LPS biosynthesis of Escherichia coli Fig. 4. The complete chemical structure of the carbohydrate ba...

Ngày tải lên: 21/02/2014, 03:20

... AND DIALOGUE STRUCTURES 227 Gross and Sidner (1985) distinguishes three structures in a discourse structure: 1) the structure of the sequence of utterances, 2) the structure of the intentions ... about the nature of dialogue structures, about the validity and usefulness of the concept of a dialogue structure, about the role of the task structure in determining dial...

Ngày tải lên: 21/02/2014, 20:20

... Kuwait, personal communication). The unique structure of the O-chain of one of these isolates further confirms this conclusion. The lipopolysaccharide structures of both H. alvei and E. coli are known ... N.K. (1994) The structure of lipo- polysaccharides of gram-negative bacteria. III. The structure of O-antigens. Biochemistry 59, 1325–1383. 14. Jansson, P E. (1999) The ch...

Ngày tải lên: 24/03/2014, 04:21

... age of 74 years (SD = 15.0). A study of the TOAST classification of the type of strokes revealed an unusually high number of cardio-embolic strokes in our cohort (50.3%). The median number of ... dBP cutoff of 70 mmHg. Sixty-five percent of the cohort had dBP<70 mmHg sometime during the stay in ED. When this group was compared to those with dBP>70 mmHg, there The i...

Ngày tải lên: 20/06/2014, 20:20

Ngày tải lên: 20/06/2014, 21:20

... Institute of Education. She completed her doctoral studies at the Department of Linguistics, The University of Hong Kong in 2006. Her chief areas of research interests are related to the study of syntax, ... use of those common types of occupation should also be included in the cur- riculum design. The following section is a brief review of the status of Cantonese in Hong Ko...

Ngày tải lên: 20/06/2014, 21:20

Ngày tải lên: 05/08/2014, 10:20