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:
“Keep your hands clean and pure from the infamous vice of corruption, a vice so infamous that it degrades even the other vices that may accompany it. Accept no present whatever; let your character in that respect be transparent and without the least speck, for as avarice is the vilest and dirtiest vice in private, corruption is so in public life.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“It is remarkable that there are few men so well employed, so much to their minds, but that a little money or fame would commonly buy them off from their present pursuit.”
—Henry David Thoreau (1817–1862)
“The present is never our end. The past and present are our means; the future alone is our end. So we never live, but hope to live; and, as we are always preparing to be happy, it is inevitable that we should never be so.”
—Blaise Pascal (1623–1662)