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Delta is the fourth letter of the Greek alphabet and has various uses in mathematics, science, and other fields. Learn about its history, pronunciation, numeral value, and related symbols such as delta particles and delta function.
The symbol was originally introduced in 1770 by Nicolas de Condorcet, who used it for a partial differential, and adopted for the partial derivative by Adrien-Marie Legendre in 1786. [3] It represents a specialized cursive type of the letter d , just as the integral sign originates as a specialized type of a long s (first used in print by ...
Learn how the Greek letter rho (Ρρ) and other Greek letters are used as symbols for constants, functions, variables, and more in various fields of study. See the typography, history, and variations of Greek letters in mathematical notation.
A comprehensive list of abbreviations and symbols used in engineering drawings, with definitions and examples. Find the meaning of dia (diameter), AISI (American Iron and Steel Institute), ANSI (American National Standards Institute), and more.
Learn how to troubleshoot common sign-in issues, such as forgetting your username or password, getting an invalid password error, or being asked to verify your identity. Find out how to use the Sign-in Helper, reset your password, or contact AOL Customer Care for live support.
A comprehensive list of physical constants and variables, and their notations, in Latin characters. Includes definitions, SI units, and examples of each symbol, such as c for speed of light, e for base of natural logarithm, and i for imaginary unit.
SkyMiles is the loyalty program of Delta Air Lines that offers points for flights, credit cards, and other partners. Learn about its history, benefits, partnerships, and Medallion status tiers.
Delta Air Lines is a major US airline that flies to 242 destinations in 52 countries across six continents. See the list of cities, airports, and notes for each destination, as well as the seasonal and terminated routes.
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