Rayleigh Differential Equation
where
. Differentiating and setting 
gives the van der Pol Equation.See also van der Pol Equation- Edge-Coloring
- Edge Connectivity
- Edge (Graph)
- Edge Number
- Edge (Polygon)
- Edge (Polyhedron)
- Edge (Polytope)
- Edgeworth Series
- e-Divisor
- Edmonds' Map
- Efron's Dice
- Egg
- Egyptian Fraction
- Ehrhart Polynomial
- Ei
- Eigenfunction
- Eigenvalue
- Eigenvector
- Eight Curve
- Eight-Point Circle Theorem
- Eight Surface
- Eikonal Equation
- Eilenberg-Mac Lane Space
- Eilenberg-Mac Lane-Steenrod-Milnor Axioms
- Eilenberg-Steenrod Axioms