In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

One of these entities that represents the location of vertices on a graph is the ""adjacency"" type. One used to identify resemblances between two data points is a similarity type. A collection of second-order partial derivatives of a function may be collected in a Hessian one of these entities. First-order derivatives are collected in the Jacobian one. If one of these entities is invertible, it is row-equivalent to an identity variety, and its determinant is nonzero. Multiplication of these entities is notably not commutative. For 10 points, name this rectangular array of numbers.
Science