Results 81 to 90 of about 956,253 (229)

Mathematical Stability Analysis of the Full SREBP-2 Pathway Model: Insights into Cholesterol Homeostasis

open access: yesAxioms
We present a mathematical analysis of the sterol regulatory element-binding protein 2 (SREBP-2) pathway, a key regulator of intracellular cholesterol homeostasis.
Mostafa Bachar
doaj   +1 more source

On the continuity of the map square root of nonnegative isomorphisms in Hilbert spaces

open access: yesRevista Integración, 2015
Let H be a real (or complex) Hilbert space. Every nonnegative operator L ∈ L(H) admits a unique nonnegative square root R ∈ L(H), i.e., a nonnegative operator R ∈ L(H) such that R2 = L.
Jeovanny de Jesus Muentes Acevedo
doaj  

The Self-Adjoint Fractional Heun Operator and Its Spectral Properties

open access: yesMathematics
This paper introduces a rigorously defined fractional Heun operator constructed through a symmetric composition of left and right Riemann–Liouville fractional derivatives.
Muath Awadalla
doaj   +1 more source

Existence of a principal eigenvalue for the Tricomi problem

open access: yesElectronic Journal of Differential Equations, 2000
The existence of a principal eigenvalue is established for the Tricomi problem in normal domains; that is, the existence of a positive eigenvalue of minimum modulus with an associated positive eigenfunction.
Daniela Lupo, Kevin R. Payne
doaj  

proof of the discreteness of the bosonic membrane spectrum

open access: yesPublicaciones en Ciencias y Tecnología, 2013
Using a spectral theorem for Schrodinger like equations, we present a proof of the discreteness of the spectrum for open bosonic membrane, considering L2 immersion maps from the 2 dimensional interval, at constant time, to at minkowski space.

doaj  

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