  In a new functional integral approach proposed for the model, we find the
regime with a deformed integration measure in which the standard integral is
replaced with the Jackson integral. We indicate the relation to a p-adic
functional integral. For the magnetic and electronic subsystems in the
effective functional that results from the operator formulation of the Hubbard
model, we find the two-parametric quantum derivative resulting in the
appearance of the quantum SU_{rq}(2) group. We establish the relation to the
one-parametric quantum derivative and the standard derivative.
