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PDE 2
PDE Terminology
17
Mathematics
Graduate
09/14/2016

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Term
Elliptic PDE
Definition
Laplace's Equation is an example of this class of PDEs
Term
Fourier Transform
Definition
An integral operator that is based on the complex form of the Fourier Series
Term
D'alembert's Solution
Definition
A general soln to the 1-D wave eqn obtained by translating the ICs by ± ct
Term
Bessel's Equation
Definition
A SL equation whose solutions are orthogonal with a weighting factor of r
Term
Cauchy-Euler Equation
Definition
A particular singular SL equation that has closed form solutions x+n and x-n
Term
Continuous Spectrum
Definition
Refers to the complete set of eigenvalues for an infinite domain BVP
Term
Influence Function
Definition
Always appears in a convolution integral involving an BVP IC
Term
Resonance
Definition
Refers to linearly amplifying solns to the wave eqn for certain source freqs.
Term
Dirac Delta Function
Definition
The limiting form of the Influence Function as "t" approaches zero.
Term
Eigenfunction Expansion
Definition
A series solution technique that can handle NH BC and source terms
Term
Characteristic
Definition
A line on an x-t plane along which a PDE may be represented as an ODE.
Term
Reference Function
Definition
A simple function designed to satisfy the NH BCs of a BVP
Term
Convolution Theorem
Definition
Solves U(ω)=F(ω)*G(ω) via the inverse transforms f (x) & g(x), if known
Term
Discrete Spectrum
Definition
Refers to the complete set of eigenvalues for a finite domain BVP
Term
Gaussian
Definition
A function whose Fourier Transform results in the same functional form
Term
Hyperbolic PDE
Definition
Any PDE of this class is readily solved via the method of characteristics
Term
Parabolic PDE
Definition
The linear heat equation is an example of this class of PDEs
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