In mathematics, II25,1 is the even 26-dimensional Lorentzian unimodular lattice. It has several unusual properties, arising from Conway's discovery that it has a norm zero Weyl vector. In particular it is closely related to the Leech lattice, and has the Conway group Co1 at the top of its automorphism group.
M. Cheng, J. Duncan, и J. Harvey. (2012)cite arxiv:1204.2779Comment: 124 pages, 75 tables; updated references and minor editing in v.2; minor editing and two new theorems in v.3.
T. Gannon. Cambridge Monographs on Mathematical Physics Cambridge University Press, Cambridge, (2006)The bridge connecting algebra, modular forms and physics.