 ##  [Method of Stationary Phase](/method-stationary-phase) 

  ##  [Method of Stationary Phase](https://natural.quantumdictionary.io/method-stationary-phase-0) 

  
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**Natural &amp; Formal Sciences Dictionary**

 
Definition

An asymptotic technique for approximating integrals with highly oscillatory integrands by isolating and expanding contributions from points where the oscillatory phase has vanishing derivative (stationary points).

 
 ##  [Method of Stationary Phase](https://puremath.quantumdictionary.io/method-stationary-phase-1) 

  
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- Mathematics &amp; Logic -

**Pure Mathematics Dictionary**

 
Definition

An asymptotic method for estimating integrals with highly oscillatory phases of the form ∫ A(x) e^{iλ φ(x)} dx for large parameter λ, focusing on contributions from points where the phase derivative φ'(x) vanishes (stationary points).