Recursion

Ouroboros, an ancient symbol depicting a serpent or dragon eating its own tail.

Recently refreshed sourdough, bubbling through fermentation: the recipe calls for some sourdough left over from the last time the same recipe was made.

$The Sierpinski triangle—a confined recursion of triangles that form a fractal$

Recursion is the process of repeating items in a self-similar way. For instance, when the surfaces of two mirrors are exactly parallel with each other, the nested images that occur are a form of infinite recursion. The term has a variety of meanings specific to a variety of disciplines ranging from linguistics to logic. The most common application of recursion is in mathematics and computer science, in which it refers to a method of defining functions in which the function being defined is applied within its own definition. Specifically, this defines an infinite number of instances (function values), using a finite expression that for some instances may refer to other instances, but in such a way that no loop or infinite chain of references can occur. The term is also used more generally to describe a process of repeating objects in a self-similar way.

单词	Recursive structure
释义	Recursive structure 原声例句 TED-Ed（视频版） Recursion was a good candidate for a universal grammar rule because it can take many forms. However, in 2005 linguists published findings on an Amazonian language called Piraha, which doesn't appear to have any recursive structures. 递归是通用语法规则的一个很好的候选者，因为它可以采用多种形式。然而，2005 年语言学家发表了关于一种名为 Piraha 的亚马逊语言的研究结果，该语言似乎没有任何递归结构。英语百科 Recursion $The Sierpinski triangle—a confined recursion of triangles that form a fractal$ Recursion is the process of repeating items in a self-similar way. For instance, when the surfaces of two mirrors are exactly parallel with each other, the nested images that occur are a form of infinite recursion. The term has a variety of meanings specific to a variety of disciplines ranging from linguistics to logic. The most common application of recursion is in mathematics and computer science, in which it refers to a method of defining functions in which the function being defined is applied within its own definition. Specifically, this defines an infinite number of instances (function values), using a finite expression that for some instances may refer to other instances, but in such a way that no loop or infinite chain of references can occur. The term is also used more generally to describe a process of repeating objects in a self-similar way.
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Recursive structure

Recursion