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1. What are the lowest temperatures at which electrons or muons can be created from thermal interactions? These are the approximate lowest temperatures at which these particles would have "frozen" out of thermal equilibrium proportions.

2. If the mass of the electron neutrino is 2.2 eV/c 2, what is the lowest temperature at which it could be formed from thermal interactions? What if its mass is 10-4 eV?

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