TY - JOUR
T1 - Spectral characterization of a graph on the flags of the eleven point biplane
AU - Blokhuis, A.
AU - Brouwer, A.E.
PY - 2012
Y1 - 2012
N2 - We characterize a 55-point graph by its spectrum $ 4^1, (-2)^{10}, (-1 \pm \sqrt{3})^{10}, ((3 \pm \sqrt{5})/2)^{12} $.
No interlacing is used: examination of tr A^m for m = 7 together with study of the representation in the eigenspace for the eigenvalue -2 suffices.
AB - We characterize a 55-point graph by its spectrum $ 4^1, (-2)^{10}, (-1 \pm \sqrt{3})^{10}, ((3 \pm \sqrt{5})/2)^{12} $.
No interlacing is used: examination of tr A^m for m = 7 together with study of the representation in the eigenspace for the eigenvalue -2 suffices.
U2 - 10.1007/s10623-011-9570-5
DO - 10.1007/s10623-011-9570-5
M3 - Article
SN - 0925-1022
VL - 65
SP - 65
EP - 69
JO - Designs, Codes and Cryptography
JF - Designs, Codes and Cryptography
IS - 1-2
ER -