Present
By the end of the 20th century, classical mechanics in physics was no longer an independent theory. Along with classical electromagnetism, it has become imbedded in relativistic quantum mechanics or quantum field theory. It defines the non-relativistic, non-quantum mechanical limit for massive particles.
Classical mechanics has also been a source of inspiration for mathematicians. The realization that the phase space in classical mechanics admits a natural description as a symplectic manifold (indeed a cotangent bundle in most cases of physical interest), and symplectic topology, which can be thought of as the study of global issues of Hamiltonian mechanics, has been a fertile area of mathematics research since the 1980s.
Read more about this topic: History Of Classical Mechanics
Famous quotes containing the word present:
“Ambition is an uncomfortable companion many times. He creates a discontent with present surroundings and achievements; he is never satisfied but always pressing forward to better things in the future. Restless, energetic, purposeful, it is ambition that makes of the creature a real man.”
—Lyndon Baines Johnson (1908–1973)
“Time present and time past
Are both perhaps present in time future,
And time future contained in time past.
If all time is eternally present
All time is unredeemable.”
—T.S. (Thomas Stearns)
“Out in Hollywood, where the streets are paved with Goldwyn, the word “sophisticate” means, very simply, “obscene.” A sophisticated story is a dirty story. Some of that meaning was wafted eastward and got itself mixed up into the present definition. So that a “sophisticate” means: one who dwells in a tower made of a DuPont substitute for ivory and holds a glass of flat champagne in one hand and an album of dirty post cards in the other.”
—Dorothy Parker (1893–1967)