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In mathematics, exactness may refer to: Exact category; Exact functor. Landweber exact functor theorem; Exact sequence; See also. Exactness of measurements;
Accuracy is also used as a statistical measure of how well a binary classification test correctly identifies or excludes a condition. That is, the accuracy is the proportion of correct predictions (both true positives and true negatives) among the total number of cases examined. [10]
A simple example of this concept involves the observation that Pearson's chi-squared test is an approximate test. Suppose Pearson's chi-squared test is used to ascertain whether a six-sided die is "fair", indicating that it renders each of the six possible outcomes equally often.
All non-0 digits and any 0s appearing between them are significant for the exactness of any number. For example, the number 12000 has two significant digits, and has implied limits of 11500 and 12500. Additional 0s may be added after a decimal separator to denote a greater exactness, increasing the number of decimals. For example, 1 has implied ...
The word Ασύμπτωτος (asymptotos) in Greek means non-coincident and puts strong emphasis on the point that approximation does not turn into coincidence. It is a salient feature of asymptotics, but this property alone does not entirely cover the idea of asymptotics and, etymologically, the term seems to be quite insufficient.
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If there exists any object + and morphism + such that + is exact, then the exactness of + is ensured. Again taking the example of the category of groups, the fact that im( f ) is the kernel of some homomorphism on H implies that it is a normal subgroup , which coincides with its conjugate closure; thus coker( f ) is isomorphic to the image H ...
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