$L_{\infty }$ norm minimization for nowhere-zero integer eigenvectors of the block graphs of Steiner triple systems and Johnson graphs

E. A. Bespalov, I. Yu. Mogilnykh, K. V. Vorob'ev

We study nowhere-zero integer eigenvectors of the block graphs of Steiner triple systems and the Johnson graphs. For the first eigenvalue we obtain the minimums of $L_{\infty }$-nor…