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:
“When each thing is unique in itself, there can be no comparison made.... There is only this strange recognition of present otherness.”
—D.H. (David Herbert)
“Open the envelope quickly,
O this is not our son’s writing, yet his name is sign’d,
O a strange hand writes for our dear son, O stricken mother’s soul!
All swims before her eyes, flashes with black, she catches the main
words only,
Sentences broken, gunshot wound in the breast, cavalry skirmish, taken to hospital,
At present low, but will soon be better.”
—Walt Whitman (1819–1892)
“One of the things that is most striking about the young generation is that they never talk about their own futures, there are no futures for this generation, not any of them and so naturally they never think of them. It is very striking, they do not live in the present they just live, as well as they can, and they do not plan. It is extraordinary that whole populations have no projects for a future, none at all.”
—Gertrude Stein (1874–1946)