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## Main Question or Discussion Point

I am doing DMRG (in traditional formalism, not MPS) for Hubbard model

H = -t ∑

In every iteration we add two sites to the system, but how do we set that how many particles are allowed in the system?

H = -t ∑

_{i}∑_{σ}c_{i,σ }c_{i+1,σ}+ U∑_{i}n_{i,σ}n_{i,σ-}In every iteration we add two sites to the system, but how do we set that how many particles are allowed in the system?

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