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>>Hey everyone,
>>the following sentence appears in a physics book's section on relativity:
>>"...[the] relativity postulate is enough to determine the way a description of events in one frame is related to the description in a different frame of the same events.  **In that relation, there appears a universal speed, the same in all frames, whose value must be found be experiment.**" Can this be treated as a consequence of the Brouwer fixed point theorem?  I mean, if the sets are the reference frames, is this speed a "fixed point" in the transformed sets?  I realize this may be grasping at straws, but it seemed interesting enough to write a question on. See you all in class. 


 

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