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The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.
If you're having issues sending and receiving emails for your AOL Mail account in a third-party email application, you may need to reauthenticate your account by removing and re-entering your password or removing and re-adding your AOL Mail account. Get the steps for common third-party email applications. Account Management · Dec 9, 2024
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Euler's totient function in number theory; the argument of a complex number in mathematics; the value of a plane angle in physics and mathematics; the angle to the z axis in spherical coordinates (mathematics) epoch or phase difference between two waves or vectors; the angle to the x axis in the xy-plane in spherical or cylindrical coordinates ...
Delta method for approximating the distribution of a function; Difference operator (Δ) Dirac delta function (δ function) Kronecker delta Laplace operator (Δ) Modular discriminant (Δ) Symmetric difference (Δ) Non-inferiority margin (δ) Δ m n, a class of sets in the analytical hierarchy, for every natural number m, n
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Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet 𐤃. [ 3 ]
If you use a 3rd-party email app to access your AOL Mail account, you may need a special code to give that app permission to access your AOL account. Learn how to create and delete app passwords. Account Management · Apr 17, 2024