variational technique
type: Concept
alternative label: variational calculus
broader: calculus
narrower: Rayleigh-Ritz method
preferred label: تکنیک تغییر @fa
related: nonlinear differential equation

calculus
type: Concept
narrower: variational technique
preferred label: حسابان @fa

nonlinear differential equation
type: Concept
preferred label: معادله دیفرانسیل غیرخطی @fa
related: variational technique

Rayleigh-Ritz method
type: Concept
broader: variational technique
preferred label: روش ریلی-ریتز @fa