If the definition of simultaneity is given from a moving system, the spherical surface will result when Einstein's definition with ? = 1/2 is used, since it is this definition which makes the velocity of light equal in all directions.
Hans Reichenbach
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...the famous assertion by Einstein that the length of a rod depends on its velocity and on the chosen definition of simultaneity. ...is based on the fact that we do not measure the length of the rod, but its projection on a system at rest. How the length of the projection depends on the choice of simultaneity can be illustrated by reference to a photograph taken through a focal-plane shutter. Such a shutter... consists of a wide band with a horizontal slit, which slides down vertically. Different bands are photographed successively on the film. Moving objects are therefore strangely distorted; the wheels of a rapidly moving car for instance, appear to be slanted. The shape of the objects in the picture will evidently depend on the speed of the shutter. Similarly, the length of the moving segment depends on the definition of simultaneity. One definition of simultaneity differs from another because events that are simultaneous for one definition occur successively for another. What may be a simultaneity projection of a moving segment for one definition is a "focal-plane shutter photograph" for another.
Hans Reichenbach
The smell of subjectivity clings to the mechanical definition of complexity as stubbornly as it sticks to the definition of information.
Hans Christian von Baeyer
If any philosopher had been asked for a definition of infinity, he might have produced some unintelligible rigmarole, but he would certainly not have been able to give a definition that had any meaning at all.
Bertrand Russell
The definition of definition is at bottom just what the maxim of pragmatism expresses.
Charles Sanders Peirce
You seem to be using some sort of logical system where when you get near any explanation, you say: “By definition my problem is insoluble. Now that explanation over there would solve it. But since I’ve defined my problem as insoluble, then by definition that solution doesn’t apply.”
Samuel R. Delany
Reichenbach, Hans
Reinfeldt, Fredrik
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