**Sum rule** may refer to:

- Sum rule in differentiation
- Sum rule in integration
- Rule of sum, a counting principle in combinatorics
- The sum rule in probability theory follows directly from the probability axioms
- Sum rule in quantum mechanics

### Other articles related to "sum rule, sum, rule":

**Sum Rule**In Differentiation

... In calculus, the

**sum rule**in differentiation is a method of finding the derivative of a function that is the

**sum**of two other functions for which derivatives exist ... The

**sum rule**in integration follows from it ... The

**rule**itself is a direct consequence of differentiation from first principles ...

**Sum Rule**In Differentiation - Proof

... Let y be a function given by the

**sum**of two functions u and v, such that Now let y, u and v be increased by small increases Δy, Δu and Δv respectively ... throughout by Δx Let Δx tend to 0 Now recall that y = u + v, giving the

**sum rule**in differentiation The

**rule**can be extended to subtraction, as follows Now use the special case of the constant ...

**Sum Rule**, and Edge of The Wedge Theorem

... scattering, which also contains the Goldberger-Miyazawa-Oehme

**Sum Rule**... The GMO

**Sum Rule**is often used in the analysis of the pion-nucleon system ...

### Famous quotes containing the words rule and/or sum:

“The principle of majority *rule* is the mildest form in which the force of numbers can be exercised. It is a pacific substitute for civil war in which the opposing armies are counted and the victory is awarded to the larger before any blood is shed. Except in the sacred tests of democracy and in the incantations of the orators, we hardly take the trouble to pretend that the *rule* of the majority is not at bottom a *rule* of force.”

—Walter Lippmann (1889–1974)

“The real risks for any artist are taken ... in pushing the work to the limits of what is possible, in the attempt to increase the *sum* of what it is possible to think. Books become good when they go to this edge and risk falling over it—when they endanger the artist by reason of what he has, or has not, artistically dared.”

—Salman Rushdie (b. 1947)