# Definition:Perturbation Theory

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## Definition

**Perturbation Theory** is a branch of applied mathematics which studies systems by investigating their behaviour when certain parameters are changed slghtly.

That is, it is the study of the effects of small disturbances.

## Also see

- Results about
**perturbation theory**can be found**here**.

## Historical Note

The discipline of perturbation theory was effectively initiated by Isaac Newton in his *Philosophiae Naturalis Principia Mathematica*, in his analysis of the Sun's gravitational effect on the Moon.

## Sources

- 1998: James G. Simmonds and James E. Mann, Jr.:
*A First Look at Perturbation Theory*(2nd ed.) ... (next): Chapter $1$: Introduction and Overview