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The phrase "approximation has been a" is correct and usable in written English.
You can use it when discussing the concept of approximation in various contexts, such as mathematics, science, or general discussions about estimates.
Example: "In many scientific fields, approximation has been a crucial tool for simplifying complex equations and making predictions."
Alternatives: "estimation has been a" or "rough calculation has been a".
Exact(1)
Gaussian approximation has been a popular method to simplify the derivation of BER equation in energy detection UWB systems.
Similar(58)
This approximation has been shown to be a valid representation the enzymatic models (Grima, 2009; Grima et al., 2014; Sanft et al., 2011; Schnell, 2014), that does not loose information under the conditions that we have in our experimental setup.
Approximation has been considered as a solution to this challenge; however, traditional approximation approaches have limitations in terms of performance and usability.
The fixed point approximation has been studied in a variety of ways and its results are useful for the other studies.
Recently, another method called A-harmonic approximation has been widely applied to prove the optimal partial regularity for nonlinear elliptic systems or subelliptic systems in the Heisenberg group and Carnot groups; see [23 29].
In both solutions, a smooth approximation has been estimated for group L 2, 1 and L1 terms by including an extremely small value.
We notice that the series solutions converge rapidly; the absolute error was obtained with only a few perturbative terms, so we say that a good approximation has been achieved, the validity range applies to the entire domain of equation (49) and there is no restriction to a smaller domain.
Such an approximation has been done in several ways.
Despite this, such an approximation has been shown to be very tight in the entire SNR region [9, 13, 24].
Such an approximation has been studied in the context of long block codes [13,14] as well as [15].
Although the behavior of the bond coat is highly nonlinear, an approximation has been developed which permits accurate description of undulation development under quite general conditions.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com