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influences (FIN) can be propagated. For example, according to relativity, physical influences cannot travel faster than the speed of light. However, Conway's proof only requires some upper bound, not necessarily the speed of light. Although, as Conway was ready to point out, this was the least verifiable of the three axioms, he stated that there is no evidence in any form that suggests it to be false and that, if it were false, human beings would
probably have found it by now.
The second axiom, SPIN, is based on Quantum theory and states that if you measure the squared speed of spin 1 particles in three perpendicular directions, you always get two 1's and a 0 (i.e. a triple of the form (a, b, c) with a, b or c equal to 0 and the other two equal to 1 in some order. The spin of these particles is usually measured as plus or minus 1 or 0, but since the experiment only requires the speed squared, we can write the triple as described above. This axiom has, to some extent, been experimentally
tested and verified.
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