Kenichiro Umezu

activity

20062023

most citedEffect of Primordial Magnetic Field on Seeds for Large Scale Structure

36 citations · 51 across the 16 of their papers we have counts for

collaborators

Showing 2017Show all

4 papers · 1 filter

math.AP2017★ 1 cited

Loop type subcontinua of positive solutions for indefinite concave-convex problems

Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu

We establish the existence of loop type subcontinua of nonnegative solutions for a class of concave-convex type elliptic equations with indefinite weights, under Dirichlet and Neum…

math.AP2017★ 1 cited

A curve of positive solutions for an indefinite sublinear Dirichlet problem

Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu

We investigate the existence of a curve $q \mapsto u_{q}$ , with $q \in (0, 1)$ , of positive solutions for the problem $(P_{a, q})$ : $- Δ u = a (x) u^{q}$ in $Ω$ , $u = 0$ on $\partial Ω$ , where $…

math.AP2017

Positive solutions of an elliptic Neumann problem with a sublinear indefinite nonlinearity

Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu

Let $Ω \subset R^{N}$ ( $N \geq 1$ ) be a bounded and smooth domain and $a : Ω \to R$ be a sign-changing weight satisfying $\int_{Ω} a < 0$ . We prove the existence of a…

math.AP2017

An indefinite concave-convex equation under a Neumann boundary condition II

Humberto Ramos Quoirin, Kenichiro Umezu

We proceed with the investigation of the problem $(P_{λ}) :$ $-Δu = λb(x)|u|^{q-2}u +a(x)|u|^{p-2}u \ \mbox{ in } Ω, \ \ \frac{\partial u}{\partial \mathbf{n}} = 0 \ \mbox{ on } \par…