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Nonlinear expectation : ウィキペディア英語版
Nonlinear expectation

In probability theory, a nonlinear expectation is a nonlinear generalization of the expectation. Nonlinear expectations are useful in utility theory as they more closely match human behavior than traditional expectations.
== Definition ==
A functional \mathbb: \mathcal \to \mathbb (where \mathcal is a vector lattice on a probability space) is a nonlinear expectation if it satisfies:
# Monotonicity: if X,Y \in \mathcal such that X \geq Y then \mathbb() \geq \mathbb()
# Preserving of constants: if c \in \mathbb then \mathbb() = c
Often other properties are also desirable, for instance convexity, subadditivity, positive homogeneity, and translative of constants.〔

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