**Machine epsilon** gives an upper bound on the relative error due to rounding in floating point arithmetic. This value characterizes computer arithmetic in the field of numerical analysis, and by extension in the subject of computational science. The quantity is also called **macheps** or **unit roundoff**, and it has the symbols Greek epsilon or bold Roman **u**, respectively.

Read more about Machine Epsilon: Values For Standard Hardware Floating Point Arithmetics, Formal Definition, Arithmetic Model, Variant Definitions, How To Determine Machine Epsilon

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