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(statistics) A statistical measure defined as scriptstyle operatorname Cov(X,Y)= operatorname E((X-𝜇)(Y-𝜈)) given two real-valued random variables X and Y, with expected values scriptstyle E(X),=,𝜇 and scriptstyle E(Y),=,𝜈.

The covariance between the two variables is high.

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send to Coventry

verb

(transitive, idiomatic) To ostracize, or systematically ignore someone.

He decided to send his ex-girlfriend to Coventry after their breakup.

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covariant

adj

(category theory) (Of a functor) which preserves composition. / (object-oriented programming) Using or relating to covariance.

The covariant nature of the function allows it to adapt to different input types.

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covariant

noun

(algebra) A bihomogeneous polynomial in x, y, ... and the coefficients of some homogeneous form in x, y, ... that is invariant under some group of linear transformations.

The covariant of the polynomial is calculated using the formula.

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cover crop

noun

Farmers use cover crops to improve soil health and prevent erosion.

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polar covalent bond

noun

(chemistry) A covalent bond in which the electrons are not shared equally, giving the bond some ionic character

Water is an example of a polar covalent bond.

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edge covering number

noun

(graph theory) The number of edges in a minimum edge cover of a graph, often denoted as 𝜌=𝜌(G).

The edge covering number of a graph is the minimum number of edges that need to be selected such that every vertex of the graph is incident to at least one selected edge.

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