Zonal Harmonic
A Spherical Harmonic which is a product of factors linear in 
, 
, and 
, with the product multipliedby 
when 
is Odd.
- Ray
- Rayleigh Differential Equation
- Rayleigh Distribution
- Rayleigh-Ritz Variational Technique
- Rayleigh's Formulas
- Rayleigh's Theorem
- Real Analysis
- Real Axis
- Real Function
- Realizer
- Real Line
- Real Matrix
- Real Number
- Real Part
- Real Polynomial
- Real Projective Plane
- Real Quadratic Field
- Rearrangement Theorem
- Reciprocal
- Reciprocal Difference
- Reciprocal Polyhedron
- Reciprocating Sphere
- Reciprocation
- Reciprocity Theorem
- Rectangle