Found 43 Documents (Results 1–43)
Uniqueness of an association scheme related to the Witt design on 11 points. (English) Zbl 1531.05248
Reviewer: Sam Mattheus (Brussel)
Partially balanced incomplete block (PBIB)-designs arising from diametral paths in some strongly regular graphs. (English) Zbl 1523.05001
The structure of the orthomorphism graph of \(\mathbb{Z}_2\times\mathbb{Z}_4\). (English) Zbl 07745832
Reviewer: Ian M. Wanless (Clayton)
Some results on the existence or nonexistence of constant block-sum triangular and other related designs. (English) Zbl 07618101
On the generalized \(\vartheta\)-number and related problems for highly symmetric graphs. (English) Zbl 1494.05048
The Paulus-Rozenfeld-Thompson graph on 26 vertices revisited and related combinatorial structures. (English) Zbl 1442.05248
Jones, Gareth A. (ed.) et al., Isomorphisms, symmetry and computations in algebraic graph theory. Selected papers based on the presentations at the workshop on algebraic graph theory, Pilsen, Czech Republic, October 3–7, 2016. Cham: Springer. Springer Proc. Math. Stat. 305, 73-154 (2020).
A spectral characterization of the \(s\)-clique extension of the triangular graphs. (English) Zbl 1433.05212
Cospectral mates for the union of some classes in the Johnson association scheme. (English) Zbl 1377.05108
Infinite families of directed strongly regular graphs using equitable partitions. (English) Zbl 1343.05069
A note on order and eigenvalue multiplicity of strongly regular graphs. (English) Zbl 1329.05312
Colbourn, Charles J. (ed.), Algebraic design theory and Hadamard matrices. ADTHM, Lethbridge, Alberta, Canada, July 8–11, 2014. Selected papers based on the presentations at the workshop and at the workshop on algebraic design theory with Hadamard matrices: applications, current trends and future directions, Banff International Research Station, Alberta, Canada, July 11–13, 2014. Cham: Springer (ISBN 978-3-319-17728-1/hbk; 978-3-319-17729-8/ebook). Springer Proceedings in Mathematics & Statistics 133, 209-212 (2015).
Graphs identified by logics with counting. (English) Zbl 1465.68101
Italiano, F. (ed.) et al., Mathematical foundations of computer science 2015. 40th international symposium, MFCS 2015, Milan, Italy, August 24–28, 2015. Proceedings. Part I. Berlin: Springer. Lect. Notes Comput. Sci. 9234, 319-330 (2015).
Semidefinite programming and eigenvalue bounds for the graph partition problem. (English) Zbl 1328.90103
Association schemes on 28 points as mergings of a half-homogeneous coherent configuration. (English) Zbl 1145.05056
Reviewer: Robert Jajcay (Terre Haute)
MSC:
05E30
Graphs with least eigenvalue \(-2\); a historical survey and recent developments in maximal exceptional graphs. (English) Zbl 1012.05113
Reviewer: Dieter Rautenbach (Aachen)
On classification of two class partially balanced designs. (English) Zbl 0985.05004
Reviewer: D.V.Chopra (Wichita)
On quasi-symmetric designs. (English) Zbl 0766.05007
Reviewer: M.J.De Resmini (Roma)
Exceptional graphs with smallest eigenvalue -2 and related problems. (English) Zbl 0770.05060
Math. Comput. 59, No. 200, 583-608 (1992); Microfiche Suppl.
Reviewer: R.L.Hemminger (Nashville)
Orthomorphisms of \(Z_ p\). (English) Zbl 0621.20006
Reviewer: E.J.F.Primrose
Root systems and the Johnson and Hamming graphs. (English) Zbl 0614.05048
Reviewer: D.A.Holton
The Johnson graph \(J(d,r)\) is unique if \((d,r)\neq (2,8)\). (English) Zbl 0587.05038
Reviewer: H. Gerber
MSC:
05C38
Designs through automorphisms and solutions of \(T_2(45,5;0,1)\). (English) Zbl 0584.62123
Reviewer: B. L. Raktoe
The graphs G(n,k) of the Johnson schemes are unique for n\(\geq 20\). (English) Zbl 0557.05049
Reviewer: A.Neumaier
Graphes liés aux espaces polaires. (French) Zbl 0554.05060
Reviewer: G.Chaty
Strongly regular graphs. (English) Zbl 0311.05122
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