## Duke Mathematical Journal

### Blowup of the BV norm in the multidimensional Keyfitz and Kranzer system

Camillo De Lellis

#### Abstract

We consider the Cauchy problem for the system ∂tui + divz(g(|u|)ui) = 0, i ∈ {1,…, k}, in m space dimensions and with gC3. When k ≥ 2 and m = 2, we show a wide choice of g's for which the bounded variation (BV) norm of admissible solutions can blow up, even when the initial data have arbitrarily small oscillation and arbitrarily small total variation, and are bounded away from the origin. When m ≥ 3, we show that this occurs whenever g is not constant, that is, unless the system reduces to k decoupled transport equations with constant coefficients.

#### Article information

Source
Duke Math. J., Volume 127, Number 2 (2005), 313-339.

Dates
First available in Project Euclid: 23 March 2005

https://projecteuclid.org/euclid.dmj/1111609854

Digital Object Identifier
doi:10.1215/S0012-7094-04-12724-1

Mathematical Reviews number (MathSciNet)
MR2130415

Zentralblatt MATH identifier
1074.35073

#### Citation

De Lellis, Camillo. Blowup of the BV norm in the multidimensional Keyfitz and Kranzer system. Duke Math. J. 127 (2005), no. 2, 313--339. doi:10.1215/S0012-7094-04-12724-1. https://projecteuclid.org/euclid.dmj/1111609854

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