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Construction of solutions to partial differential equations by the use of transformation groups

Citation

Bluman, George W. (1968) Construction of solutions to partial differential equations by the use of transformation groups. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04082005-155822

Abstract

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A systematic approach is given for finding similarity solutions to partial differential equations by the use of transformation groups.

If a one-parameter group of transformations leaves invariant a partial differential equation and its accompanying boundary conditions, then the number of variables can be reduced by one. In order to find the group of a given partial differential equation, the "classical" and "non-classical" methods are discussed. Initially no special boundary conditions are imposed since the invariances of the equation are used to find the general class of invariant boundary conditions.

New exact solutions to the heat equation are derived. In addition new exact solutions are found for the transition probability density function corresponding to a particular class of first order nonlinear stochastic differential equations. The equation of nonlinear heat conduction is considered from the classical point of view.

The conformal group in n "space-like" and m "time-like" dimensions, C(n, m), which is the group leaving invariant [...], is shown to be locally isomorphic to S O (n+l, m+l) for n + m >= 3. Thus locally compact operators, besides pure rotations, leave invariant Laplace's equation in n >= 3 dimensions. These are used to find closed bounded geometries for which the number of variables in Laplace's equation can be reduced.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:boundary value problems; conformal group; symmetries and differential equations
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied And Computational Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Lagerstrom, Paco A. (advisor)
  • Cole, Julian D. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:14 November 1967
Author Email:bluman (AT) math.ubc.ca
Record Number:CaltechETD:etd-04082005-155822
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-04082005-155822
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1309
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:08 Apr 2005
Last Modified:26 Dec 2012 02:37

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