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Obata’s Rigidity Theorem for Metric Measure Spaces

Christian Ketterer (2015)

Analysis and Geometry in Metric Spaces

We prove Obata’s rigidity theorem for metric measure spaces that satisfy a Riemannian curvaturedimension condition. Additionally,we show that a lower bound K for the generalizedHessian of a sufficiently regular function u holds if and only if u is K-convex. A corollary is also a rigidity result for higher order eigenvalues.

On a Class of Fractional Type Integral Equations in Variable Exponent Spaces

Rafeiro, Humberto, Samko, Stefan (2007)

Fractional Calculus and Applied Analysis

2000 Mathematics Subject Classification: 45A05, 45B05, 45E05,45P05, 46E30We obtain a criterion of Fredholmness and formula for the Fredholm index of a certain class of one-dimensional integral operators M with a weak singularity in the kernel, from the variable exponent Lebesgue space L^p(·) ([a, b], ?) to the Sobolev type space L^α,p(·) ([a, b], ?) of fractional smoothness. We also give formulas of closed form solutions ϕ ∈ L^p(·) of the 1st kind integral equation M0ϕ = f, known as the generalized...

On a converse inequality for maximal functions in Orlicz spaces

H. Kita (1996)

Studia Mathematica

Let Φ ( t ) = ʃ 0 t a ( s ) d s and Ψ ( t ) = ʃ 0 t b ( s ) d s , where a(s) is a positive continuous function such that ʃ 1 a ( s ) / s d s = and b(s) is quasi-increasing and l i m s b ( s ) = . Then the following statements for the Hardy-Littlewood maximal function Mf(x) are equivalent: (j) there exist positive constants c 1 and s 0 such that ʃ 1 s a ( t ) / t d t c 1 b ( c 1 s ) for all s s 0 ; (jj) there exist positive constants c 2 and c 3 such that ʃ 0 2 π Ψ ( ( c 2 ) / ( | | ) | ( x ) | ) d x c 3 + c 3 ʃ 0 2 π Φ ( 1 / ( | | ) ) M f ( x ) d x for all L 1 ( ) .

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