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Every ray of light moves in the “stationary coordinate system” with the same velocity c, the velocity being independent of the condition whether this ray of light is emitted by a body at rest or in motion.

However, later in the paper, he writes:

we take into consideration the fact that light when viewed from the stationary system, is always propagated along those axes with the velocity √{c

and^{2}-v^{2}}.Now the ray of light moves relative to the origin of k with a velocity c-v, measured in the stationary system

**This appears self-contradictory... light speed cannot be all three:**

- constant (c)
- non-constant (√{c
^{2}-v^{2}}) - non-constant (c-v)