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deficiency
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Deficiency
A deficiency is generally a lack of something. It may also refer to:
- A deficient number, in mathematics, a number n for which s(n) < 2n
- Angular deficiency, in geometry, the difference between a sum of angles and the corresponding sum in a Euclidean plane
- Deficiency (medicine), including various types of malnutrition, as well as genetic diseases caused by deficiencies of endogenously produced proteins.
- A deficiency in construction, an item, or condition that is considered sub-standard, or below minimum expectations
- Genetic deletion, in genetics, is also called a deficiency
- A deficiency judgment, in the law of real estate
- A tax deficiency, an amount owed in taxes over and above what has been submitted in payment
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Mangel
Mangel steht für:
- die Fehlerhaftigkeit eines Produktes, siehe Mangel (Qualität)
- einen Begriff im Recht, siehe Mangel (Recht)
- ein aus mehreren Rollen bestehendes Gerät, siehe Mangel (Gerät)
- eine Kategorie der Existenzphilosophie und steht dort für etwas Unerreichtes oder Verfehltes
- die Bezeichnung einer ungenügenden oder falsch zusammengestellten Ernährung, siehe Mangelernährung
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Numero difettivo
Un numero difettivo è un numero naturale maggiore della somma dei suoi divisori propri.
Per esempio, 10 è un numero difettivo perché è superiore alla somma dei suoi divisori: (1+2+5)=8.
Tutti i numeri primi e le loro potenze sono numeri difettivi. Tutti i divisori propri dei numeri difettivi e dei numeri perfetti sono a loro volta numeri difettivi.
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Gebrekkig getal
In de wiskunde, is een gebrekkig getal of defect getal een getal n waarvoor s(n) < 2n. Hierin is s(n) de som van alle positieve getallen waardoor n te delen is, inclusief n zelf (delerfunctie). De waarde 2n - s(n) wordt het tekort van n genoemd.
Gebrekkige getallen werden geïntroduceerd door Nicomachus' Introductio Arithmetica (circa 100). De eerste paar gebrekkige getallen zijn 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, ... .
Er bestaan oneindig veel even en oneven gebrekkige getallen. Bijvoorbeeld, alle priemgetallen, alle machten van priemgetallen en alle zuivere delers van gebrekkige of perfecte getallen zijn gebrekkig.
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Número defectivo
Em matemática, um número defectivo (número defetivo) ou número deficiente é um inteiro n para o qual s(n) < 2n. A função s(n) é a função divisor: a soma de todos os divisores positivos de n, incluindo o próprio n. O valor 2n - s(n) é a defectividade de n.
Um número não defectivo é chamado número abundante.
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