Electronic Journal of Differential Equations,
Vol. 2008(2008), No. 34, pp. 1-10.

Title: Remarks on vacuum state and uniqueness of concentration process
 
Author: Vladimir G. Danilov (Moscow Technical Univ., Russia)

Abstract: 
 We give two examples of nonuniqueness of generalized solutions
 of pressureless gas dynamics systems.
 In both of these examples, the presence of the Dirac 
 delta-function leads to nonuniqueness.
 
Submitted December 12, 2007. Published March 12, 2008.
Math Subject Classifications: 35L65, 35L67.
Key Words: Zero-pressure gas dynamics system; vacuum state; 
           delta-shock solution.