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counterexample 25:
 
counterexample 25:
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Actually, according to the relativistic formula <math>E^2 = m^2*c^4+p^2*c^2</math>, momentum is not strictly dependent on rest mass, but is dependent on energy as well. Since light has energy, it can have momentum under relativity.
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Actually, according to the relativistic formula <math>E^2 = m^2c^4+p^2c^2</math>, momentum is not strictly dependent on rest mass, but is dependent on energy as well. Since light has energy, it can have momentum under relativity.
    
counterexample 31:
 
counterexample 31:
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