Mathwords E e Eccentricity Echelon Form of a Matrix Edge of a Polyhedron Element of a Matrix Element of a Set Ellipse Ellipsoid Elliptic Geometry Empty Set End Behavior Epsilon (Ε ε) Equality, Properties of Equation Equation of a Line Equation Rules Equiangular Triangle Equidistant Equilateral Triangle Equivalence Properties of Equality Equivalence Relation Equivalent Systems of Equations Essential Discontinuity Eta (Η η) Euclidean Geometry Euler Line Euler's Formula Euler's Formula (Polyhedra) Evaluate Even Function Even Number Event Exact Values of Trig Functions Exclusive (interval) Exclusive or Expand Expansion by Cofactors Expected Value Experiment Explicit Differentiation Explicit Formula of a Sequence Explicit Function Exponent Exponent Rules Exponential Decay Exponential Function Exponential Growth Exponential Model Exponentiation Expression Exterior Angle of a Polygon Extraneous Solution Extreme Value Theorem Extreme Values of a Polynomial Extremum New TermsEigenvalueEigenvectorEmpirical Rule (68-95-99.7 Rule)Epsilon-Delta DefinitionEquation vs. ExpressionEuclidean DistanceExistential QuantifierExperimental ProbabilityExponential EquationExponential RegressionExterior Angle TheoremExtrapolationExtrema