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In mathematical analysis, and applications in geometry, applied mathematics, engineering, and natural sciences, a function of a real variable is a function whose domain is the real numbers , or a subset of that contains an interval of positive length. Most real functions that are considered and studied are differentiable in some interval.The most widely considered such functions are the real functions, which are the real-valued functions of a real variable, that is, the functions of a real variable whose codomain is the set of real numbers.

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  • Function of a real variable (en)
  • Funzione di variabile reale (it)
  • 实函数 (zh)
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  • 实函数(Real function),指定义域和值域均为实数集的子集的函数。實函數的特性之一是可以在坐標平面上畫出圖形。 (zh)
  • In mathematical analysis, and applications in geometry, applied mathematics, engineering, and natural sciences, a function of a real variable is a function whose domain is the real numbers , or a subset of that contains an interval of positive length. Most real functions that are considered and studied are differentiable in some interval.The most widely considered such functions are the real functions, which are the real-valued functions of a real variable, that is, the functions of a real variable whose codomain is the set of real numbers. (en)
  • Una funzione di variabile reale è una funzione che prende valori sull'insieme dei numeri reali e restituisce altri numeri reali. Più precisamente, una tale funzione ha come dominio e codominio o un suo sottoinsieme. È possibile generalizzare il dominio e considerare il prodotto cartesiano di con sé stesso un numero arbitrario di volte. La funzione prenderà uno o più numeri reali e restituirà uno o più numeri reali. Si dice dunque che l'argomento della funzione è una -upla di numeri reali, o un vettore di . Rappresentazione di un campo vettoriale (it)
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