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#2
31 ตุลาคม 2020, 08:55
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In algebra, the kernel of a homomorphism (function that preserves the structure) is generally the inverse image of 0 (except for groups whose operation is denoted multiplicatively, where the kernel is the inverse image of 1). An important special case is the kernel of a linear map. The kernel of a matrix, also called the null space, is the kernel of the linear map defined by the matrix. Formally, a polygon P is star-shaped if there exists a point z such that for each point p of P the segment zp lies entirely within P.[1] The set of all points z with this property (that is, the set of points from which all of P is visible) is called the kernel of P. Kernel is used in statistical analysis to refer to a window function. The term "kernel" has several distinct meanings in different branches of statistics. 
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