Topology of the isospectral variety of zero-diagonal Jacobi matrices is investigated using the Volterra system.
Comments: 2 pages, AMS-LaTeX, short communication; v2,v3: minor corrections; v4: shortened in order to fit "Russian Math. Surveys" requirements. See also more extended text arXiv:0705.0805
Journal: Uspekhi Mat. Nauk 62 (2007), no. 3 (375), 213-214 (Russian); English translation in Russian Math. Surveys 62 (2007), no. 3, 626-628.
