en Sum rule

Sum rule may refer to:

Sum rule in differentiation, Differentiation rules #Differentiation is linear
Sum rule in integration, see Integral #Properties
Addition principle, a counting principle in combinatorics
In probability theory, an implication of the additivity axiom, see Probability axioms #Further consequences
Sum rule in quantum mechanics
QCD sum rules, non-perturbative techniques in quantum chromodynamics
Sum rules (quantum field theory), relations between static and dynamic quantities in quantum field theory

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