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  • A multiplicity result for a non-local parametric problem with periodic boundary conditions
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Vincenzo Ambrosio; Rossella Bartolo; Giovanni Molica Bisci

    We look for bounded periodic solutions for a parametric fractional problem involving a continuous nonlinearity with subcritical growth. By using a variant of Caffarelli and Silvestre extension method adapted to the periodic case and variational tools we prove the existence of at least three bounded periodic solutions when the parameter varies in an appropriate range.

    更新日期:2020-04-23
  • Tautological relations for stable maps to a target variety
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Younghan Bae

    We define tautological relations for the moduli space of stable maps to a target variety. Using the double ramification cycle formula for target varieties of Janda–Pandharipande–Pixton–Zvonkine [20], we construct non-trivial tautological relations parallel to Pixton’s double ramification cycle relations for the moduli of curves. Examples and applications are discussed.

    更新日期:2020-04-23
  • Periodic flows with global sections
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Khadija Ben Rejeb

    Let $G = \lbrace h_t \; \vert \; t \in \mathbb{R} \rbrace$ be a continuous flow on a connected $n$-manifold $M$. The flow $G$ is said to be strongly reversible by an involution $\tau$ if $h_{-t} = \tau h_t \tau$ for all $t \in \mathbb{R}$, and it is said to be periodic if $h_s = $ identity for some $s \in \mathbb{R}^\ast$. A closed subset $K$ of $M$ is called a global section for $G$ if every orbit

    更新日期:2020-04-23
  • Inequalities that sharpen the triangle inequality for sums of $N$ functions in $L^p$
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Eric A. Carlen; Rupert L. Frank; Elliott H. Lieb

    We study $L^p$ inequalities that sharpen the triangle inequality for sums of $N$ functions in $L^p$.

    更新日期:2020-04-23
  • On the locus of Prym curves where the Prym-canonical map is not an embedding
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Ciro Ciliberto; Thomas Dedieu; Concettina Galati; Andreas Leopold Knutsen

    We prove that the locus of Prym curves $(C, \eta)$ of genus $g \geq 5$ for which the Prym-canonical system $\lvert \omega_C (\eta) \rvert$ is base point free but the Prym-canonical map is not an embedding is irreducible and unirational of dimension $2g + 1$.

    更新日期:2020-04-23
  • Singular equivalences arising from Morita rings
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Nan Gao; Wen-Hui Zhao

    We obtain new classes of singular equivalences which are constructed from Gorenstein-projective modules.

    更新日期:2020-04-23
  • Maps in dimension one with infinite entropy
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Peter Hazard

    For each real $\alpha , 0 \leq \alpha \lt 1$, we give examples of endomorphisms in dimension one with infinite topological entropy which are $\alpha$‑Hölder; and for each real $p , 1 \leq p\lt \infty$, we also give examples of endomorphisms in dimension one with infinite topological entropy which are $(1, p)$-Sobolev. These examples are constructed within a family of endomorphisms with infinite topological

    更新日期:2020-04-23
  • On systems of non-overlapping Haar polynomials
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Grigori A. Karagulyan

    We prove that $\operatorname{log} n$ is an almost everywhere convergence Weyl multiplier for the orthonormal systems of non-overlapping Haar polynomials. Moreover, it is done for the general systems of martingale difference polynomials.

    更新日期:2020-04-23
  • Sharp estimate on the inner distance in planar domains
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Danka Lučić; Enrico Pasqualetto; Tapio Rajala

    We show that the inner distance inside a bounded planar domain is at most the one-dimensional Hausdorff measure of the boundary of the domain. We prove this sharp result by establishing an improved Painlevé length estimate for connected sets and by using the metric removability of totally disconnected sets, proven by Kalmykov, Kovalev, and Rajala. We also give a totally disconnected example showing

    更新日期:2020-04-23
  • Radial variation of Bloch functions on the unit ball of $\mathbb{R}^d$
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Paul F. X. Müller; Katharina Riegler

    In [9] Anderson’s conjecture was proven by comparing values of Bloch functions with the variation of the function. We extend that result on Bloch functions from two to arbitrary dimension and prove that\[\int \limits_{[0, x]} \lvert \nabla b(\zeta) \rvert e^{b(\zeta)} \: d \lvert \zeta \rvert \lt \infty \; \textrm{.}\]In the second part of the paper, we show that the area or volume integral\[\int \limits_{B^d}

    更新日期:2020-04-23
  • Invariant curves for holomorphic foliations on singular surfaces
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Edileno de Almeida Santos

    The Separatrix Theorem of C. Camacho and P. Sad says that there exists at least one invariant curve (separatrix) passing through the singularity of a germ of holomorphic foliation on complex surface, when the surface underlying the foliation is smooth or when it is singular and the dual graph of resolution surface singularity is a tree. Under some assumptions, we obtain existence of separatrix even

    更新日期:2020-04-23
  • A note on Chern coefficients and Cohen–Macaulay rings
    Ark. Mat. (IF 0.579) Pub Date : 2020-04-23
    Nguyen Thi Thanh Tam; Hoang Le Truong

    In this paper, we investigate the relationship between the index of reducibility and Chern coefficients for primary ideals. As an application, we give characterizations of a Cohen–Macaulay ring in terms of its type, irreducible multiplicity, and Chern coefficients with respect to certain parameter ideals in Noetherian local rings.

    更新日期:2020-04-23
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