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{{Short description|Concept in game theory}}
In [[mathematics]], particularly in [[game theory]] and [[mathematical economics]], a function is '''graph continuous''' if its [[Graph (function)|graph]]—the set of all input-output pairs—is a closed set in the [[product topology]] of the ___domain and codomain. In simpler terms, if a sequence of points on the graph converges, its limit point must also belong to the graph. This concept, related to the [[Closed graph theorem|closed graph property]] in [[functional analysis]], allows for a broader class of discontinuous payoff functions while enabling equilibrium analysis in economic models.
Graph continuity gained prominence through the work of [[Partha Dasgupta]] and [[Eric Maskin]] in their 1986 paper on the existence of equilibria in discontinuous economic games.<ref>{{cite journal |last1=Dasgupta |first1=Partha |last2=Maskin |first2=Eric |year=1986 |title=The Existence of Equilibrium in Discontinuous Economic Games, I: Theory |journal=The Review of Economic Studies |volume=53 |issue=1 |pages=1–26 |doi=10.2307/2297588}}</ref> Unlike [[Continuous function|standard continuity]], which requires small changes in inputs to produce small changes in outputs, graph continuity permits certain well-behaved discontinuities. This property is crucial for establishing equilibria in settings such as [[auction theory]], [[oligopoly]] models, and [[Location theory|___location competition]], where payoff discontinuities naturally arise.
==Notation and preliminaries==
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==References==
{{Reflist}}
* [[Partha Dasgupta]] and [[Eric Maskin]] 1986. "The existence of equilibrium in discontinuous economic games, I: theory". ''The Review of Economic Studies'', 53(1):1–26
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