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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.
Delta Air Lines is the oldest operating airline in the United States and a founding member of the SkyTeam alliance. It serves 325 destinations in 52 countries with a fleet of 989 aircraft and employs over 100,000 people.
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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.
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.
Find the IATA, ICAO and call sign codes for airlines starting with D, such as Delta Air Lines (DL, KMLL, DELTA). See historical assignments and comments for completeness.
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