Journal title
Le Matematiche

   
Home  /  Le Matematiche  /  Vol: 64 Núm: 1 Par: 0 (2009)  /  Article
ARTICLE
TITLE

On the symmetric block design with parameters (153, 57, 21)

SUMMARY

In this paper it is proved that:A) Up to isomorphism and duality there are exactly two possible orbital structures for a putative symmetric block design with parameters (153, 57, 21) constructed using the Frobenius group F_{17·16}B) Up to isomorphism and duality there are exactly 16 possible orbital structures for a putative symmetric block design with parameters (153, 57, 21) constructed using the collineation group G.

PAGES
pp. 147 - 159

 Articles related

Teng Fang, Xin Gui Fang, Binzhou Xia, Sanming Zhou    

A finite graph G\Gamma is GG-symmetric if it admits GG as a group of automorphisms acting transitively on V(G)V(\Gamma) and transitively on the set of ordered pairs of adjacent vertices of G\Gamma. If V(G)V(\Gamma) admits a nontrivial GG-invariant partit... see more


S. K. Vaidya, D.D. Bantva    

A cactus is a connected graph whose all the blocks are isomorphic to cycle or complete graph on n vertices. We introduce symmetric regular cacti and a procedure for their construction. We discuss some characteristics of symmetric regular cacti. The numbe... see more

Revista: Proyecciones

H. F. Jones    

The PT symmetric potential V0[cos(2px/a) + i? sin(2px/a)] has a completely real spectrum for ? = 1, and begins to develop complex eigenvalues for ? > 1. At the symmetry-breaking threshold ? = 1 some of the eigenvectors become degenerate, giving rise t... see more


Olivier Danvy, Ulrik P. Schultz    

Lambda-lifting a functional program transforms it into a set of recursiveequations. We present the symmetric transformation: lambda-dropping.Lambda-dropping a set of recursive equations restores blockstructure and lexical scope.For lack of scope, recursi... see more


Mohammad Nasir Uddin, Md. Saifur Rahman    

SARS-CoV-2 has created an agonizing pandemic situation all over the world. The inhibition of SARS-CoV-2 main protease (Mpro) by the blockage of viral replication is considered an important drug target to the many researchers working to discover specific ... see more