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Delta ( / ˈdɛltə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, [ˈðelta]) [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] Letters that come from delta include Latin D and Cyrillic Д .
Delta-v (more known as " change in velocity "), symbolized as and pronounced deltah-vee, as used in spacecraft flight dynamics, is a measure of the impulse per unit of spacecraft mass that is needed to perform a maneuver such as launching from or landing on a planet or moon, or an in-space orbital maneuver. It is a scalar that has the units of ...
The Ganges Delta (also known the Ganges-Brahmaputra Delta, the Sundarbans Delta or the Bengal Delta [1]) is a river delta in Eastern South Asia predominantly covering the Bengal region of the subcontinent, consisting of Bangladesh and the Indian state of West Bengal. It is the world's largest river delta [2] [3] and it empties into the Bay of ...
The Nile Delta ( Arabic: دلتا النيل, Delta an-Nīl or simply الدلتا, ad-Delta) is the delta formed in Lower Egypt where the Nile River spreads out and drains into the Mediterranean Sea. [1] It is one of the world's larger deltas—from Alexandria in the west to Port Said in the east, it covers 240 km (150 mi) of Mediterranean ...
In mathematical analysis, the Dirac delta function (or δ distribution ), also known as the unit impulse, [1] is a generalized function on the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one. [2] [3] [4] Since there is no function having this property, modelling the delta ...
Kronecker delta. In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just non-negative integers. The function is 1 if the variables are equal, and 0 otherwise: or with use of Iverson brackets : For example, because , whereas because . The Kronecker delta appears naturally in many areas of ...
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The Mekong Delta (Vietnamese: Đồng bằng Sông Cửu Long, lit. 'Nine Dragon River Delta' or simply Đồng Bằng Sông Mê Kông, 'Mekong River Delta'), also known as the Western Region (Vietnamese: Miền Tây) or South-western region (Vietnamese: Tây Nam Bộ), is the region in southwestern Vietnam where the Mekong River approaches and empties into the sea through a network of ...