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space complexity class
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space complexity class
Encyclopedia
理学
空间复杂性类
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space complexity class
空间复杂性类
空间复杂性(space complexity)研究计算各种问题所需要的空间资源。在讨论空间复杂性的场合,人们使用的图灵机一般包含一条只读的输入带(input tape)、一条可读可写的工作带(work tape)和一条只写的输出带(output tape)。而所需的空间资源就是指计算过程中使用工作带的大小。给定函数,用表示所有能由(确定)图灵机在空间内能够判定的问题构成的类;而包括所有非确定图灵机在空间内能够判定的问题(见复杂性类)。类似时间复杂性的研究,人们定义了很多空间复杂性类。其中最著名的包括多项式空间类(见多项式空间PSPACE类)、非确定对数空间类(见非确定对数空间NL类)和对数空间类(见对数空间L类)。
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