Re: Question about light clock and derivation of time dilation

Androcles a écrit :
So there is or there is not a "yesterday" ?

There used to be one, but it is over. 

So the word "yesterday" as a meaning, as well as
the expression "yesterday, at noon on Princes street",
as well as the space-time location (1,0,3,-1).

How could you confuse the trivial fact of
talking about events taking place before
an arbitrary origin of a clock and traveling
to the past ?

How can you confuse an event in the past with a vector? 

Technically speaking, space-time can be represented by
an affine space, not a vectorial one :

http://mathworld.wolfram.com/AffineSpace.html

Anyway it doesn't matter much, since by choosing a
convenient origin this space is isomorphic to a
vectorial one.

It is even worse than confusing

closing velocity and relative velocity (what you
do for years).

What's the difference, 

You should know.

.