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общая лексика
ошибка аппроксимации
ошибка приближения
The approximation error in a data value is the discrepancy between an exact value and some approximation to it. This error can be expressed as an absolute error (the numerical amount of the discrepancy) or as a relative error (the absolute error divided by the data value).
An approximation error can occur because of computing machine precision or measurement error (e.g. the length of a piece of paper is 4.53 cm but the ruler only allows you to estimate it to the nearest 0.1 cm, so you measure it as 4.5 cm).
In the mathematical field of numerical analysis, the numerical stability of an algorithm indicates how the error is propagated by the algorithm.