The phrase "approximation to this" is correct and usable in written English.
It can be used when discussing a close estimate or a near representation of something.
Example: "The approximation to this mathematical model provides a clearer understanding of the underlying principles."
Alternatives: "estimate of this" or "near representation of this".
However, Schmandt and Galán used a discrete time approximation to this process.
A very useful approximation to this relation is established through numerical experiments which is exact for all practical purposes.
By using the Model Predictive Control (MPC) technique, the discrete-time approximation to this problem is converted into a nonlinear programming problem and then solved.
Ideally society should equalize outcomes for each centile of every type, but in general this will not be possible, so one seeks a logically possible approximation to this ideal and identifies this as equality of opportunity.
Sakov [1] and Ford and Smith [2] have independently resolved the "infinite forward scatter" paradox encountered in earlier applications of the Born approximation to this problem.
In this paper we show that this problem is computationally intractable even in surprisingly restricted cases and even if we settle for an approximation to this probability.
If we go to higher order approximations, we will obtain better approximations to this exact solution.
Various approximations to this problem have been proposed in recent years.
This includes an approximation theorem that relates the E-theory over a general space to the E-theories over finite approximations to this space.
Even-ordered finite difference approximations to this derivative were found to be more stable (allow for larger density gradients) than odd-ordered approximations.
By analysing various stationary states of operation formulated by optimal control theory, we find numerical support for the hypothesis of minimum entropy production, namely that the state of operation with constant entropy production, and also in some cases constant thermal driving force, are good approximations to this most energy efficient state of operation.
