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Publicacions Matemàtiques, 1992
The author introduces the notion of a \(G_ 1\)-structure of order 2 (briefly \(G^ 2_ 1\)- structures.) Let us recall that a \(G_ 1\)- structure on a manifold \(V\) is defined by an endomorphism \(J\) of the tangent bundle \(TV\) with constant rank and such that \(J^ 2 = 0\). Then a \(G^ 2_ 1\)-structure is a generalization of almost tangent structures.
openaire +7 more sources

Iterative oscillation results for second-order differential equations with advanced argument

Electronic Journal of Differential Equations, 2017
This article concerns the oscillation of solutions to a linear second-order differential equation with advanced argument. Sufficient oscillation conditions involving limit inferior are given which essentially improve known results.
Irena Jadlovska
doaj

Gains from second-order approximations [PDF]

The benefit from using second-order approximations tostochastic dynamic rational expec- tations models is explained. By example of the neoclassical growth model, this note as- sesses the accuracy of the obtained approximation.
Matthias Paustian
core

On second-order linear Stieltjes differential equations with non-constant coefficients

Open Mathematics
In this work, we define the notions of Wronskian and simplified Wronskian for Stieltjes derivatives and study some of their properties in a similar manner to the context of time scales or the usual derivative.
Fernández Francisco J. +2 more
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Second order dissipative operators [PDF]