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Greg Egan just proved something nice: the E10 lattice, famous in string theory and supergravity, can be described as the lattice of self-adjoint matrices with integral octonions as entries!
I'm not sure this result is new, but I've been wanting it for quite a while and haven't seen it anywhere. So, it's nice to know.
I'm not sure this result is new, but I've been wanting it for quite a while and haven't seen it anywhere. So, it's nice to know.