  The author investigates the general Lie algebra of operators of coordinates,
momenta, and Lorentz group generators, which can be used in quantum gravity,
theories with generalized uncertainty principle, double and triple relativity
and theories with noncommutative space-time and momentum spaces. The structure
constants of this algebra depend on the constants {\it c} and {\it h}, as well
as additional constants with dimensions of action ({\it H}), length ({\it L}),
and mass ({\it M}). In the limiting case of infinite {\it H}, {\it L}, and {\it
M}, the algebra goes into that of operators of the canonical quantum theory in
Minkowski space-time. Some representations of this algebra and equations for
generalized fields depending on additional fundamental physical constants are
given.
