Dergiler / Journal of Algebra Combinatorics Discrete Structures and Applications / 2022 / Cilt: 9 - Sayı: 2

Growth of harmonic functions on biregular trees

Sayfa
1–8
Yayın Tarihi
2022-05-13
DOI
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

Next, we prove that if $f$ is a positive harmonic function on the tree and $x$, $y$ are two vertices with $d(x,y)=2$, then $f(x)/(qr)\leq f(y)\leq qr\cdot f(x)$.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:On a biregular tree of degrees $q+1$ and $r+1$, we study the growth of two classes of harmonic functions.
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Temel Bulgular & Veri:First, we prove that if $f$ is a bounded harmonic function on the tree and $x$, $y$ are two adjacent vertices, then $|f(x)-f(y)|\leq 2 (qr-1)\|f\|_\infty/((q+1)(r+1))$, thus generalizing a result of Cohen and Colonna for regular trees.
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Sonuç & Katkı:Next, we prove that if $f$ is a positive harmonic function on the tree and $x$, $y$ are two vertices with $d(x,y)=2$, then $f(x)/(qr)\leq f(y)\leq qr\cdot f(x)$.
🔬Tür:Araştırma Makalesi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Biregular tree · Growth · Harmonic function

Abstract

On a biregular tree of degrees $q+1$ and $r+1$, we study the growth of two classes of harmonic functions. First, we prove that if $f$ is a bounded harmonic function on the tree and $x$, $y$ are two adjacent vertices, then $|f(x)-f(y)|\leq 2 (qr-1)\|f\|_\infty/((q+1)(r+1))$, thus generalizing a result of Cohen and Colonna for regular trees. Next, we prove that if $f$ is a positive harmonic function on the tree and $x$, $y$ are two vertices with $d(x,y)=2$, then $f(x)/(qr)\leq f(y)\leq qr\cdot f(x)$.

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Bu Makaleye Atıf Yap

VİELİ, F. J. G. (2022). Growth of harmonic functions on biregular trees. Journal of Algebra Combinatorics Discrete Structures and Applications, Cilt: 9 - Sayı: 2, 1–8. https://ajindex.com/articles/861484

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Kaynakça (7)

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  3. N. L. Biggs, Discrete mathematics, Clarendon Press, Oxford University Press, New York (1985)
  4. P. Cartier, Fonctions harmoniques sur un arbre, Sympos. Math. 9 (1972) 203–270
  5. J. M. Cohen, F. Colonna, The Bloch space of a homogeneous tree, Bol. Soc. Mat. Mex. 37 (1992) 63–82
  6. E. Nelson, A proof of Liouville’s theorem, Proc. Amer. Math. Soc. 12(6) (1961) 995
  7. W. Woess, Random walks on infinite graphs and groups, Cambridge University Press (2000).