Characteristic (Partial Differential Equation)
Paths in a 2-D plane used to transform Partial Differential Equations intosystems of Ordinary Differential Equations. They were invented by Riemann.For an example of the use of characteristics, consider the equation
Now let
. Since
it follows that
, 
, and 
. Integrating gives 
, 
, and
, where the constants of integration are 0 and 
.- Leading Digit Phenomenon
- Leading Order Analysis
- Leaf (Foliation)
- Leaf (Tree)
- Leakage
- Least Bound
- Least Common Multiple
- Least Deficient Number
- Least Period
- Least Prime Factor
- Least Squares Fitting
- Least Squares Fitting--Exponential
- Least Squares Fitting--Logarithmic
- Least Squares Fitting--Power Law
- Least Upper Bound
- Lebesgue Constants (Fourier Series)
- Lebesgue Constants (Lagrange Interpolation)
- Lebesgue Covering Dimension
- Lebesgue Dimension
- Lebesgue Integrable
- Lebesgue Integral
- Lebesgue Measurability Problem
- Lebesgue Measure
- Lebesgue Minimal Problem
- Lebesgue-Radon Integral