Robertson Condition
For the Helmholtz Differential Equation to be Separable in a coordinate system, the Scale Factors 
in the Laplacian
 | (1) |
and 
defined by | (2) |
 | (3) |
References
Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, Part 1. New York: McGraw-Hill, p. 510, 1953.
- Bell Polynomial
- Bell Triangle
- Beltrami Differential Equation
- Beltrami Field
- Beltrami Identity
- Bend (Curvature)
- Bend (Knot)
- Benford's Law
- Benham's Wheel
- Bennequin's Conjecture
- Benson's Formula
- Ber
- Beraha Constants
- Berger-Kazdan Comparison Theorem
- Bergman Kernel
- Bergman Space
- Bernoulli Differential Equation
- Bernoulli Distribution
- Bernoulli Function
- Bernoulli Inequality
- Bernoulli Lemniscate
- Bernoulli Number
- Bernoulli Polynomial
- Bernoulli's Paradox
- Bernoulli's Theorem