# On the elliptic problem Δu-|∇u| q +λu p =0

Chipot, M; Weissler, F (1988). On the elliptic problem Δu-|∇u| q +λu p =0. In: Ni, W M; Peletier, L A; Serrin, J. Nonlinear diffusion equations and their equilibrium states I (Berkeley, CA, 1986). New York: Springer, 237-243.

## Abstract

We consider regular solutions of the elliptic problem (1) $\Delta u-|\nabla u|^q+\lambda u^p=0$, and $u>0$ for $x\in\Omega$, $u=0$ on $x\in\partial \Omega$, where $\Omega \subset \bold R^n$ is a smooth, bounded domain, $u\colon \overline{\Omega }\rightarrow \bold R$ is $C^2$, and $q, p, \lambda$ are parameters satisfying $q, p>1$ and $\lambda >0$. The motivation for studying problem (1) comes from a related parabolic problem, $(2)\ v_t=\Delta v-|\nabla v|^q+v^p\ (t>0,\ x\in\Omega )$, $v(0, x)=\varphi(x)\ge 0\ (x\in\Omega )$, $v(t, x)=0\ (t>0$, $x\in\partial \Omega )$, where now $v=v(t, x)$. Previously, we investigated whether there exist initial values $\varphi$ for which the resulting solution of (2) blows up in finite time. It turns out that a natural candidate for such a $\varphi$ is a solution of (1). More precisely, assume either $(3)\ 1<q< 2p/(p+1)$, $n/2<(p+1)/(p-1)$, $\lambda>0$ is sufficiently small, or $(4)\ q=2p/(p+1)$, $p$ is sufficiently large, $0<\lambda\le 2/(p+1)$. It follows that if $\varphi$ is a solution of (1), then the resulting solution of (2) blows up in finite time.
Thus we are led to investigate under what conditions there exist solutions of (1) and whether these solutions are unique.

## Abstract

We consider regular solutions of the elliptic problem (1) $\Delta u-|\nabla u|^q+\lambda u^p=0$, and $u>0$ for $x\in\Omega$, $u=0$ on $x\in\partial \Omega$, where $\Omega \subset \bold R^n$ is a smooth, bounded domain, $u\colon \overline{\Omega }\rightarrow \bold R$ is $C^2$, and $q, p, \lambda$ are parameters satisfying $q, p>1$ and $\lambda >0$. The motivation for studying problem (1) comes from a related parabolic problem, $(2)\ v_t=\Delta v-|\nabla v|^q+v^p\ (t>0,\ x\in\Omega )$, $v(0, x)=\varphi(x)\ge 0\ (x\in\Omega )$, $v(t, x)=0\ (t>0$, $x\in\partial \Omega )$, where now $v=v(t, x)$. Previously, we investigated whether there exist initial values $\varphi$ for which the resulting solution of (2) blows up in finite time. It turns out that a natural candidate for such a $\varphi$ is a solution of (1). More precisely, assume either $(3)\ 1<q< 2p/(p+1)$, $n/2<(p+1)/(p-1)$, $\lambda>0$ is sufficiently small, or $(4)\ q=2p/(p+1)$, $p$ is sufficiently large, $0<\lambda\le 2/(p+1)$. It follows that if $\varphi$ is a solution of (1), then the resulting solution of (2) blows up in finite time.
Thus we are led to investigate under what conditions there exist solutions of (1) and whether these solutions are unique.

## Statistics

### Altmetrics

Item Type: Book Section, refereed, original work 07 Faculty of Science > Institute of Mathematics 510 Mathematics regular solutions; existence; uniqueness; support English 1988 28 Oct 2009 13:37 14 Sep 2016 13:39 Springer Mathematical Sciences Research Institute Publications. 12 0940-4740 0-387-96771-0 http://www.springer.com/mathematics/analysis/book/978-0-387-96771-4 http://www.zentralblatt-math.org/zbmath/search/?q=an%3A0699.35102http://www.recherche-portal.ch/primo_library/libweb/action/search.do?fn=search&mode=Advanced&vid=ZAD&vl%28186672378UI0%29=isbn&vl%281UI0%29=contains&vl%28freeText0%29=0-387-96771-0

Full text not available from this repository.

## TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.