delta : Java Glossary

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delta
A Greek letter, (δ: lower case and Δ: upper case). Δ is often used to represent a difference, usually a small difference. In calculus you talk about epsilon/delta ε/δ arguments for calculating the limit of a series. You might also talk about delta files — the files that contain the differences between two sets of files. These are typically much smaller than either set of files, and can be transmitted more efficiently. JUnit has a method assertEquals( float expected, float actual, float delta). Here the word delta means the tolerance, how close the numbers have to be to be considered equal.

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