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#No material object of nonzero mass can travel at or greater than the speed of light.  (Objects of zero mass, such as photons, travel at exactly the speed of light.)

#No material object of nonzero mass can travel at or greater than the speed of light.  (Objects of zero mass, such as photons, travel at exactly the speed of light.)

#Information can not travel faster than the speed of light.<ref>This assumption is commonly restated in this manner.  For example, a discussion of hypothetical [[tachyons]] talks "about using tachyons to transmit information faster than the speed of light, '''in violation of Special Relativity'''."[http://www.math.ucr.edu/home/baez/physics/ParticleAndNuclear/tachyons.html]</ref>  This is sometimes stated as:

#Information can not travel faster than the speed of light.<ref>This assumption is commonly restated in this manner.  For example, a discussion of hypothetical [[tachyons]] talks "about using tachyons to transmit information faster than the speed of light, '''in violation of Special Relativity'''."[http://www.math.ucr.edu/home/baez/physics/ParticleAndNuclear/tachyons.html]</ref>  This is sometimes stated as:

#There is no "action at a distance", because that would make observations dependent on the frame of reference.  See [[Action at a distance]] for a discussion of this point.

#There is no "action at a distance," because that would make observations dependent on the frame of reference.  See [[Action at a distance]] for a discussion of this point.

When the assumptions are stated clearly as above, the weaknesses in the theory are more apparent.  There “is” action at a distance in [[quantum entanglement]] and apparently also in gravity, as no gravitons can be found. However, no information has yet been transmitted via quantum entanglement, so while non-locality violates the spirit of relativity it is consistent with it if relativity is limited to the transmission of information. [[Quantum field theory]], an attempt to partially reconcile [[quantum mechanics]] with relativity, is incomplete at best.  As to the second assumption, it is contrary to the [[arrow of time]], which illustrates the lack of symmetry in time.  Logical defects include the incoherence of relativistic mass (see discussion below) and the lack of relativistic constraints near the beginning the universe (see above).

When the assumptions are stated clearly as above, the weaknesses in the theory are more apparent.  There “is” action at a distance in [[quantum entanglement]] and apparently also in gravity, as no gravitons can be found. However, no information has yet been transmitted via quantum entanglement, so while non-locality violates the spirit of relativity it is consistent with it if relativity is limited to the transmission of information. [[Quantum field theory]], an attempt to partially reconcile [[quantum mechanics]] with relativity, is incomplete at best.  As to the second assumption, it is contrary to the [[arrow of time]], which illustrates the lack of symmetry in time.  Logical defects include the incoherence of relativistic mass (see discussion below) and the lack of relativistic constraints near the beginning the universe (see above).