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→‎Mass increase: restored a portion of the momentum math, with clearer explanation
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:<math>E = m c^2</math>
 
:<math>E = m c^2</math>
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Now a concept of the 4-momentum <math>p</math> of a particle is taught, such that the square of the magnitude of <math>p</math> satisfies:
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<math>||p||^2 = -p_x^2-p_y^2-p_z^2+E^2 = m_0^2c^4</math>
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in any inertial reference frame. The magnitude of the 4-momentum, in any inertial frame, equals the rest mass <math>m_0</math> of the particle (in units where <math>c=1</math>).
    
==Evidence for Relativity==
 
==Evidence for Relativity==
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