Dear Dr B: Why is Lorentz-invariance in conflict with discreteness?

Can we build up space-time fromdiscrete entities?

�Could you elaborate (even) more on [�] the exact tension between Lorentz invariance and attempts for discretisation?

Best,

Noa�

Dear Noa:
Discretization is a common procedure to deal with infinities. Since quantum mechanics relates large energies to short (wave) lengths, introducing a shortest possible distance corresponds to cutting off