# Isoperimetric problem

In

mathematics ,**isoperimetric problem**may refer to:* The

isoperimetric inequality between the length of a closed curve and the area of the region it encloses, as well as its generalizations.

* Any of a class of extremal problems arising inmathematical physics , usually involvingeigenvalue s of suitabledifferential operator s.

* In eighteenth century use, any problem incalculus of variations .

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