The phrase "a relatively simple equation" is correct and usable in written English.
You can use it when describing an equation that is not overly complex or difficult to understand, often in mathematical or scientific contexts.
Example: "In this study, we will analyze the results using a relatively simple equation to illustrate the relationship between the variables."
Alternatives: "a fairly straightforward equation" or "an uncomplicated equation".
We regularize the degenerate part through replacing the term div ( | ∇ u m | p ( x ) − 2 ∇ u m ) by div { ( | ∇ ( σ u m + ϵ u ) | 2 + η ) p ( x ) − 2 2 ∇ ( σ u m + ϵ u ) }, ϵ, η > 0. In Section 3, in order to apply the topological degree method, we combine these regularized problems with a relatively simpler equation and derive some a priori estimates.
For plastic hinge length, the relatively simple equation of ( L_{p} = xh ) proposed by Bayrak and Sheikkh (1997) is used, where x is an experimentally determined parameter ranging from 0.9 to 1.0 and h is the section depth.
Ergo, when applied to society this relatively simple equation makes clear the huge complexity of inequality and, I'd argue, advocates a much more primal solution than what can be found in pay scale or job grade.
Trading plutonium for oil is a relatively simple political equation.
The authors also propose a relatively simple differential equation to describe the creep-mode evolution of the variator.
This approach enables modelling of mass and energy transfer through relatively simple equations, and is useful for understanding crop production.
Relatively simple equations are presented for the maximum permanent transverse displacements which give good agreement with the corresponding experimental data, and therefore, can be used for design purposes, safety calculations, security studies, hazard assessments and forensic investigations.
It is found that a quasi-steady state approximation can be used for the catalyst and changes in the gas phase can be accounted, under the allowed model simplifications, with a relatively simple unsteady state equation.
There are many independent parameters in this system, and one of the motivations for the present study is to establish the extent to which we can capture observed behavior with a relatively simple hybrid differential equation model in the face of several independent energy dissipation mechanisms coming from friction and impact.
