IPM Positions

Head, Information Center Member, Scientific Council, School of Computer Science (1996 - Present ) Member of Scientific Council of IPM (1989 - Present) Founding Fellow and Senior Scientist of IPM

Past IPM Positions

Head, School of Mathematics (1996 - 2006)

Non IPM Affiliations

Professor of University of Tehran (Retired)

member of, American Mathematics Society, Iranian Mathematical Society, Mathematical Association of America, Institute for Combinatorics and Applications

Research Interests

Combinatorial Design Theory, Coding Theory, and Graph Theory

Awards

1. Iranian Ministry of Higher Education Fellowship (1977-78) 2. Distinguished Researcher, University of Tehran (1991-92) 3. Winner of Kharazmi International Award in Fundamental Research (2000) 4. Distinguished Professor of the Country (2005)

Research Activities

I work in a branch of Combinatorics called Combinatorial designs, in general, and in particular, with emphasis in computational approach to constructing designs of different kinds. Large sets and classification of t-designs are of my main concern these days.

Present Research Project at IPM

Combinatorical Designs, t-designs

Related Papers

1.	E. Ghorbani, Sara. Kamali and G. B. Khosrovshahi (Joint with D. S. Krotov) On the volumes and affine types of trades Electron. J. Combin. (Publishied) [abstract]

2.	N. Ghareghani and G. B. Khosrovshahi Minimum cycle basis of direct product of K2×Kn Linear Algebra Appl. 458 (2014), 671-678  [abstract]

3.	G. B. Khosrovshahi (Joint with M. H. Ahmadi, N. Akhlaghinia, and Ch. Maysoori) On the inclusion matrix W23 (v) Linear Algebra Appl. (Accepted) [abstract]

4.	G. B. Khosrovshahi (Joint with M.H. Ahmadi, N. Akhlaghinia, and Ch. Maysoori) More on the Wilson Wtk(v) matrices Electron. J. Combin. 21 (2014), #P2.53  [abstract]

5.	S. Akbari, G.B. Khosrovshahi and A. Mofidi Nowhere-zero 6-flows: A linear algebraic approach Bull. Inst. Combin. Appl. (Accepted) [abstract]

6.	E. Ghorbani and G. B. Khosrovshahi (Joint with M. R. Faghihi and S. Tat) On optimality of designs with three distinct eigenvalues Electron. J. Combin. 20 (2013), # P16  [abstract]

7.	S. Akbari, N. Ghareghani, G. B. Khosrovshahi and S. Zare A note on zero-sum 5-flows in regular graphs Electron. J. Combin. 19 (2012), #P7  [abstract]

8.	E. Ghorbani and G. B. Khosrovshahi Simple signed Steiner triple systems J. Combin. Des. (2012), DOI: 10.1002/jcd.21297  [abstract]

9.	S. Akbari, G. B. Khosrovshahi and A. Mofidi Zero-sum flows in designs J. Combin. Des. 19 (2011), 355-364  [abstract]

10.	S. Akbari, N. Ghareghani and G. B. Khosrovshahi (Joint with A. Mahmoody) On zero-sum 6-flows of graphs Linear Algebra Appl. 430 (2009), 3047-3052  [abstract]

11.	G. B.. Khosrovshahi and B. Tayfeh-Rezaie Trades and t-designs London Math. Soc. Lecture Note Ser. ( In: Surveys in combinatorics 2009) [abstract]

12.	G. B. Khosrovshahi and B. Tayfeh-Rezaie Classification of simple 2-(11,3,3) designs Discrete Math. 309 (2009), 515-520  [abstract]

13.	E. Ghorbani, G. B. Khosrovshahi, Ch. Maysoori and M. Mohammad-Noori Inclusion matrices and chains J. Combin. Theory Ser. A 115 (2008), 878-887  [abstract]

14.	M. Behbahani, G. B. Khosrovshahi and B. Tayfeh On the spectrum of simple T(2, 3, v) trades J. Statist. Plann. Inference 138 (2008), 2236-2242  [abstract]

15.	G. B. Khosrovshahi (Joint with R. Laue) t-designs with t ≥ 3  (In Handbooks) [abstract]

16.	G. B. Khosrovshahi (Joint with A. S. Hedayat) Trades  (In Handbooks) [abstract]

17.	S. Akbari, A. Alipour, E. Ghorbani and G. B. Khosrovshahi {−1,0,1}-basis for the null space of a forest Linear Algebra Appl. 414 (2006), 506-511  [abstract]

18.	S. Akbari, N. Ghareghani, G. B. Khosrovshahi and H. R. Maimani The kernels of the incidence matrices of graphs revisited Linear Algebra Appl. 414 (2006), 617-625  [abstract]

19.	G. B. Khosrovshahi and B. Tayfeh-Rezaie Large sets of t-designs through partitionable sets: A survey Discrete Math. 306 (2006), 2993-3004  [abstract]

20.	G. B. Khosrovshahi, R. Laue and B. Tayfeh-Rezaie On large sets of t-designs of size four Bayreuth. Math. Schr. 74 (2005), 136-144  [abstract]

21.	A. Hoorfar and G. B. Khosrovshahi On the nonexistence of Steiner t-(v,k) trades Ars Combin. 75 (2005), 195--204  [abstract]

22.	M. Mohammad-Noori, Z. Eslami and G. B. Khosrovshahi Enumeration of t-designs through intersection matrices Des. Codes Cryptogr. 32 (2004), 185-191  [abstract]

23.	Z . Eslami, B. Tayfeh-Rezaie, G. B. Khosrovshahi and M. Mohammad-Noori Some new 4-designs Ars Combin. 73 (2004), 225-229  [abstract]

24.	G. B. Khosrovshahi and B. Tayfeh-Rezaie Some indecomposable t-designs Des. Codes Cryptogr. 32 (2004), 235-238  [abstract]

25.	A. Hoorfar and G. B. Khosrovshahi On the existence of trades of large volumes Ars Combin. 73 (2004), 45-48  [abstract]

26.	G. B. Khosrovshahi and B. Tayfeh-Rezaie Some results on the existence of large sets of t-designs J. Combin. Des. 11 (2003), 144-151  [abstract]

27.	G. B. Khosrovshahi and B. Tayfeh-Rezaie Root cases of large sets of t-designs Discrete Math. 263 (2003), 143-155  [abstract]

28.	H. Kharaghani, F. Kamali and G. B. Khosrovshahi Some Bush-type Hadamard matrices J. Statist. Plann. Inference 113 (2003), 375-384  [abstract]

29.	M. Emamy, G. B. Khosrovshahi and Ch. Maysoori Some designs of small orders and their codes J. Combin. Math. Combin. Comput. 43 (2003), 101-117  [abstract]

30.	G. B. Khosrovshahi, M. Mohammad-Noori and B. Tayfeh-Rezaie Classification of 6-(14,7,4) designs with nontrivial automorphism groups J. Combin. Des. 10 (2002), 180-194  [abstract]

31.	S. Akbari and G. B. Khosrovshahi On the smallest edge defining sets of graphs Ars Combin. 63 (2002), 293-303  [abstract]

32.	G. B. Khosrovshahi, Ch. Maysoori and B. Tayfeh-Rezaie A note on 3-factorizations of K10 J. Combin. Des. 9 (2001), 379-383  [abstract]

33.	Z. Eslami and G. B. Khosrovshahi Some new 6-(14,7,4) designs J. Combin. Theory Ser. A 93 (2001), 141-152  [abstract]

34.	Z. Eslami, G. B. Khosrovshahi and B. Tayfeh-Rezaie On classification of 2-(8,3) and 2-(9,3) trades J. Combin. Math. Combin. Comput. 38 (2001), 231-242  [abstract]

35.	G. B. Khosrovshahi and B. Tayfeh-Rezaie A new proof of a classical theorem in design theory J. Combin. Theory Ser. A 93 (2001), 391-396  [abstract]

36.	G. B. Khosrovshahi, R. Naserasr and B. Tayfeh-Rezaie Ternary trades and their codes J. Statist. Plann. Inference 95 (2001), 237-243  [abstract]

37.	G. B. Khosrovshahi, H. R. Maimani and R. Torabi An automorphism-free 4-(15,5,5) design J. Combin. Math. Combin. Comput. 37 (2001), 187-192  [abstract]

38.	Z. Eslami and G. B. Khosrovshahi Classification of some large sets and designs J. Geom. 67 (2000), 105-110  [abstract]

39.	Z. Eslami and G. B. Khosrovshahi A complete classification of 3-(11,4,4) designs with nontrivial automorphism group J. Combin. Des. 8 (2000), 419-425  [abstract]

40.	Z. Eslami, G. B. Khosrovshahi and B. Tayfeh-Rezaie On halvings of the 2-(10,3,8) design J. Statist. Plann. Inference 86 (2000), 411-419  [abstract]

41.	G. B. Khosrovshahi and R. Torabi Maximal trades Ars Combin. 51 (1999), 211-223  [abstract]

42.	R. Naserasr and G. B. Khosrovshahi Hypergraphical codes arising from binary trades Des. Codes Cryptogr. 18 (1999), 183-186  [abstract]

43.	G. B. Khosrovshahi and Ch. Maysoori On the structure of higher incidence matrices Bull. Inst. Combin. Appl. 25 (1999), 13-22  [abstract]

44.	G. B. Khosrovshahi, H. R. Maimani and R. Torabi On trades: an update Discrete Appl. Math. 95 (1999), 361-376  [abstract]

45.	G. B. Khosrovshahi, H. R. Maimani and R. Torabi Classification of simple 2-(6,3) and 2-(7,3) trades Australas. J. Combin. 19 (1999), 55-72  [abstract]

46.	G. B. Khosrovshahi and H. R. Maimani On 2-(v,3) Steiner trades of small volumes Ars Combin. 52 (1999), 199-220  [abstract]

47.	G. B. Khosrovshahi and R. Naserasr On compressing complete designs J. Statist. Plann. Inference 74 (1998), 193-201  [abstract]

48.	G. B. Khosrovshahi and H. Yousefi-Azari Octahedrals in Steiner quadruple systems Util. Math. 51 (1997), 33-39  [abstract]

49.	G. B. Khosrovshahi and N. M. Singhi Further characterization of basic trades J. Statist. Plann. Inference 58 (1997), 87-92  [abstract]

50.	G. B. Khosrovshahi, A. Nowzari-Dalini and R. Torabi Trading signed designs and some new 4-(12,5,4) designs Des. Codes Cryptogr. 11 (1997), 279-288  [abstract]

51.	G. B. Khosrovshahi and H. R. Maimani Smallest defining sets for 2-(10,5,3) designs Australas. J. Combin. 15 (1997), 31-35  [abstract]

52.	S. Shahriari, S. Akbari, G. B. Khosrovshahi and Ch. Maysoori On maximum size anti-Pasch sets of triples London Math. Soc. Lecture Note Ser. (1997), 7-14  [abstract]

53.	G. B. Khosrovshahi and H. Yousefi-Azari Construction of some cyclic anti-Pasch Steiner triple systems of small orders J. Combin. Inform. System Sci. 21 (1996), 1-4  [abstract]

54.	B. Kalantari and G. B. Khosrovshahi Magic labeling in graphs: bounds complexity and an application to a variant of TSP Networks 28 (1996), 211-219  [abstract]

55.	A. Shokoufandeh, S. Ajoodani-Namini and G. B. Khosrovshahi Intersections of triple systems: small orders J. Combin. Math. Combin. Comput. 20 (1996), 33-52  [abstract]

56.	G. B. Khosrovshahi Problem 226(BCC12). Non-crossing queens Discrete Math.( In: Research problems) [abstract]

57.	R. Torabi and G. B. Khosrovshahi A note on labelings of graphs Linear Multilinear Algebra 39 (1995), 165-169  [abstract]

58.	G. B. Khosrovshahi, A. Nowzari-Dalini and R. Torabi Some simple and automorphism-free 2-(15,5,4) designs J. Combin. Des. 3 (1995), 285-292  [abstract]

59.	G. B. Khosrovshahi and Ch. Maysoori On the bases for trades Linear Algebra Appl. 226-228 (1995), 731-748  [abstract]

60.	S. Ajoodani-Namini and G. B. Khosrovshahi On a conjecture of A. Hartman ( In: Combinatorics Advances) [abstract]

61.	G. B. Khosrovshahi and S. Ajoodani-Namini More on halving the complete designs Discrete Math. 135 (1994), 29-37  [abstract]