entirelyentityentourageentriesentries of a matrixentringentropyentropy of a partitionentropy of an endomorphismentryentry blockentry criterionentry criterion basisentry of a determinantentry of a matrixenumerableenumerable setsenumerably infiniteenumerateenumeratingenumerationenumeration problemenumeration theoremenumerativeenvelopeenvironmentenvironmentalenvironmental elementsepicycleepicycloidepigraphepimorphicepimorphismepitrochoidepitrochoidal curveepsilonepsilon chainepsilon deltaepsilon delta methodeqipotentialequalequal eventsequal matricesequal probabilitiesequal setsequal vectorsequalityequality constraintsequality of funcitonsequality of numbers