Sign convention

From Academic Kids

In some physics textbooks and articles, certain quantities are defined with the opposite sign from that which is used in other publications. This lack of standardization is a frequent source of confusion, misunderstandings, and even outright errors. A standard choice of sign for a definition is called a sign convention. Sometimes, this term is used more broadly to include factors of i and 2π.

A noncomprehensive list of sign conventions:

It is often considered good form to state explicitly which sign convention is to be used at the beginning of each book or article.

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