The phrase "primary equations" is correct and usable in written English.
You can use it when you are referring to equations that are basic or central to a subject. For example, "These primary equations provide the foundation for the rest of the study."
Age was removed from the primary equations for two reasons.
In that case, the primary equations are homogeneous, and a conventional hybrid multistage explicit method based on central differencing and second- and fourth-order scalar artificial dissipation can be applied to solve both the primary and adjoint systems.
For a given formulation, rigorous construction of the Schur-complement, in which the full Jacobian is reduced to a system for the primary equations in terms of the primary unknowns, is performed purely algebraically.
The method of transforming the set of flux equations for two simultaneous processes into a new set of processes is reviewed and applied to diffusion in one-phase materials where the two primary equations describe the individual diffusion of the components and the new ones describe the migration of Kirkendall markers and interdiffusion.
However, in this paper, the primary equation from the aforementioned model was evaluated for its ability to characterize a thin film's response to temperature.
Since the advent of well logging, resistivity logs have been constantly used to determine the value of water saturation by using the Archie equation as the primary equation to determine water saturation.
We predict the fitted values from the first stage and insert that back into the structural equation, as the IV, replacing the endogenous regressor, before performing ordinary least square (OLS) estimation on the second stage, which is the primary equation of interest.
This time around, the respective spouses are part of the primary equation.
The primary equation of this model is The most common formulation for λi is the log-linear model, ln λ i = β'X i The variables were regressed on a set of factors integrated into the equation.
The primary model equations adopted in the variable velocity hydrodynamic model are listed in Table 2.
Boundary condition implementations are considered sufficient when discretized with the same order of accuracy as the primary governing equations; however, careless implementations of boundary conditions can result in significantly larger numerical error.
