Editing Classical limit (section)

==Relativity and other deformations==
Other familiar deformations in physics involve:

*The deformation of classical Newtonian into relativistic mechanics ([[special relativity]]), with deformation parameter {{math|''v''/''c''}}; the classical limit involves small speeds, so {{math|''v''/''c''&nbsp;→&nbsp;0}}, and the systems appear to obey Newtonian mechanics. 
*Similarly for the deformation of Newtonian gravity into [[general relativity]], with deformation parameter Schwarzschild-radius/characteristic-dimension, we find that objects once again appear to obey classical mechanics (flat space), when the mass of an object times the square of the [[Planck length]] is much smaller than its size and the sizes of the problem addressed. See [[Newtonian limit]].
*Wave optics might also be regarded as a deformation of [[geometrical optics|ray optics]] for deformation parameter {{math|''λ''/''a''}}.
*Likewise, [[thermodynamics]] deforms to [[statistical mechanics]] with deformation parameter {{math|1/''N''}}.