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"What
"classical physics" refers to depends on the
context. When discussing special relativity,
it refers to the Newtonian physics
which preceded relativity, i.e. the branches of
physics
based on principles developed before the rise of
relativity
and quantum mechanics.
When discussing general relativity,
it refers to the result of modifying Newtonian
physics to incorporate special relativity. When
discussing quantum mechanics,
it refers to non-quantum physics, including special
relativity, and general relativity.Source;
Wikipedia