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- Tsonka Stefanova Baicheva, Svetlana Topalova
- ArXiv
- 2010

Optimal (v, 4, 2, 1) optical orthogonal codes (OOC) with v <= 75 and v 6= 71 are classified up to equivalence. One (v, 4, 2, 1) OOC is presented for all v ≤ 181, for which an optimal OOC exists.

- Svetlana Topalova, Stela Zhelezova
- Graphs and Combinatorics
- 2010

- Svetlana Topalova
- Discrete Mathematics
- 2003

- Svetlana Topalova, Stela Zhelezova
- Applicable Algebra in Engineering, Communication…
- 2013

A parallelism in $$PG(n,q)$$ P G ( n , q ) is transitive if it has an automorphism group which is transitive on the spreads. A parallelism is regular if all its spreads are regular. In $$PG(3,4)$$ P G ( 3 , 4 ) no examples of transitive and no regular parallelisms are known. Transitive parallelisms in $$PG(3,4)$$ P G ( 3 , 4 ) must have automorphisms of… (More)

- Svetlana Topalova, Stela Zhelezova
- Des. Codes Cryptography
- 2015

- Tsonka Stefanova Baicheva, Svetlana Topalova
- Probl. Inf. Transm.
- 2011

- Petteri Kaski, Patric R. J. Östergård, Svetlana Topalova, Rosen Zlatarski
- Discrete Mathematics
- 2008

- Veerle Fack, Svetlana Topalova, Joost Winne, Rosen Zlatarski
- Discrete Mathematics
- 2006

A classification of the doubles of the projective plane of order 4 with respect to the order of the automorphism group is presented and it is established that, up to isomorphism, there are 1 746 461 307 doubles. We start with the designs possessing non-trivial automorphisms. Since the designs with automorphisms of odd prime orders have been constructed… (More)

- Stoyan N. Kapralov, Svetlana Topalova
- Ars Comb.
- 1998

1.1 Projective spaces and spreads. A projective space is a geometry consisting of a set of points and a set of lines, where each line is a subset of the point set, such that the following axioms hold: • Any two points are on exactly one line. • Let A, B, C, D be four distinct points no three of which are collinear. If the lines AB and CD intersect each… (More)