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Fite and Kamenev type oscillation criteria for second order elliptic equations

Zhiting Xu (2007)

Annales Polonici Mathematici

Fite and Kamenev type oscillation criteria for the second order nonlinear damped elliptic differential equation i , j = 1 N D i [ a i j ( x ) D j y ] + i = 1 N b i ( x ) D i y + p ( x ) f ( y ) = 0 are obtained. Our results are extensions of those for ordinary differential equations and improve some known oscillation criteria in the literature. Several examples are given to show the significance of the results.

Fully nonlinear second order elliptic equations with large zeroth order coefficient

L. C. Evans, Pierre-Louis Lions (1981)

Annales de l'institut Fourier

We prove the existence of classical solutions to certain fully non-linear second order elliptic equations with large zeroth order coefficient. The principal tool is an a priori estimate asserting that the C 2 , α -norm of the solution cannot lie in a certain interval of the positive real axis.

Gagliardo-Nirenberg inequalities in logarithmic spaces

Agnieszka Kałamajska, Katarzyna Pietruska-Pałuba (2006)

Colloquium Mathematicae

We obtain interpolation inequalities for derivatives: M q , α ( | f ( x ) | ) d x C [ M p , β ( Φ ( x , | f | , | ( 2 ) f | ) ) d x + M r , γ ( Φ ( x , | f | , | ( 2 ) f | ) ) d x ] , and their counterparts expressed in Orlicz norms: ||∇f||²(q,α) ≤ C||Φ₁(x,|f|,|∇(2)f|)||(p,β) ||Φ₂(x,|f|,|∇(2)f|)||(r,γ) , where | | · | | ( s , κ ) is the Orlicz norm relative to the function M s , κ ( t ) = t s ( l n ( 2 + t ) ) κ . The parameters p,q,r,α,β,γ and the Carathéodory functions Φ₁,Φ₂ are supposed to satisfy certain consistency conditions. Some of the classical Gagliardo-Nirenberg inequalities follow as a special case. Gagliardo-Nirenberg inequalities in logarithmic spaces with higher...

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