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Distribution function for a range of rest masses

Volume elements in position and momentum space

Stress-energy tensor for the electromagnetic field

Inertial mass per unit volume (revisited)

Stress-energy tensor and energy-momentum conservation for a perfect fluid

Global conservation of energy in an inertial frame

Fluid in an inertial frame

Global law of charge conservation in an inertial frame

Evaluation of 3-surface integral in spacetime

Spacetime volumes