Einstein Relatively Easy

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An event is something that happens instantaneously at a single point in spacetime, such as a light flashing, or a position on a moving object passing another point.

All events in spacetime are defined using the four coordinates t, x , y, z.

It is often referred as xμ using index notation, with μ = {0,1,2,3}

The quantity xμ is known as the four-position (it is one example of four-vector) as it describes an event or position in spacetime using the four components (ct,x,y,z).

We can think of a particule moving through spacetime as a succession of events, and if we link all these events together we would obtain a line representing the particle's travel through spacetime. This line is called the particle's world line.

 

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"Five or six weeks elapsed between the conception of the idea for the special theory of relativity and the completion of the relevant publication" Einstein to Carl Seeling on March 11, 1952

"Every boy in the streets of Göttingen understands more about four-dimensional geometry than Einstein. Yet, in spite of that, Einstein did the work and not the mathematicians."
David Hilbert

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