Principal value
Values along one branch of a multivalued function so that it is single-valued / From Wikipedia, the free encyclopedia
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For the use of the term principal value in describing improper integrals, see Cauchy principal value.
For the use of the term principal value for arcsines, arccosines, etc. , see Inverse trigonometric function § Principal value .
In mathematics, specifically complex analysis, the principal values of a multivalued function are the values along one chosen branch of that function, so that it is single-valued. A simple case arises in taking the square root of a positive real number. For example, 4 has two square roots: 2 and −2; of these the positive root, 2, is considered the principal root and is denoted as
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