<p>In the paper, we establish a generalized result of Heittokangas et al. (Complex Var Elliptic Equ 56(1–4):81–92, 2011) concerning the sharing of distinct periodic small functions with period <i>c</i> for meromorphic functions in <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {C}^m\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">C</mi> </mrow> <mi>m</mi> </msup> </math></EquationSource> </InlineEquation>. We demonstrate that if <i>f</i>(<i>z</i>) and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(f(z+c)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo>+</mo> <mi>c</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> share three distinct <i>c</i>-periodic small functions <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="38" /> </InlineMediaObject> <EquationSource Format="TEX">\(a_1(z)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>a</mi> <mn>1</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="38" /> </InlineMediaObject> <EquationSource Format="TEX">\(a_2(z)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>a</mi> <mn>2</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="38" /> </InlineMediaObject> <EquationSource Format="TEX">\(a_3(z)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>a</mi> <mn>3</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> CM, where <i>f</i>(<i>z</i>) is a non-constant meromorphic function in <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq6.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="24" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {C}^m\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="double-struck">C</mi> </mrow> <mi>m</mi> </msup> </math></EquationSource> </InlineEquation>, then either <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq7.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="114" /> </InlineMediaObject> <EquationSource Format="TEX">\(f(z) = f(z+c)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> <mo>=</mo> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo>+</mo> <mi>c</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> or <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq8.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="122" /> </InlineMediaObject> <EquationSource Format="TEX">\(f(z) = f(z+2c)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo stretchy="false">)</mo> <mo>=</mo> <mi>f</mi> <mo stretchy="false">(</mo> <mi>z</mi> <mo>+</mo> <mn>2</mn> <mi>c</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, with the latter case arising when <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq9.gif" Format="GIF" Height="33" Rendition="HTML" Resolution="72" Type="Linedraw" Width="136" /> </InlineMediaObject> <EquationSource Format="TEX">\(\limsup \limits _{r\rightarrow \infty }\frac{\log T(r,f)}{r}&gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <munder> <mo movablelimits="false">lim sup</mo> <mrow> <mi>r</mi> <mo stretchy="false">→</mo> <mi>∞</mi> </mrow> </munder> <mfrac> <mrow> <mo>log</mo> <mi>T</mi> <mo stretchy="false">(</mo> <mi>r</mi> <mo>,</mo> <mi>f</mi> <mo stretchy="false">)</mo> </mrow> <mi>r</mi> </mfrac> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>. This extends the result of Heittokangas et al. (Complex Var. Elliptic Equ. 56(1–4):81–92, 2011) for finite order meromorphic function in <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13226_2025_778_Article_IEq10.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {C}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="double-struck">C</mi> </math></EquationSource> </InlineEquation> to meromorphic functions in higher dimensions. Moreover, we show by plenty of examples that our results are best possible in certain senses.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Periodic behavior of meromorphic functions sharing values with their shifts in several complex variables

  • Sujoy Majumder,
  • Pradip Das

摘要

In the paper, we establish a generalized result of Heittokangas et al. (Complex Var Elliptic Equ 56(1–4):81–92, 2011) concerning the sharing of distinct periodic small functions with period c for meromorphic functions in \(\mathbb {C}^m\) C m . We demonstrate that if f(z) and \(f(z+c)\) f ( z + c ) share three distinct c-periodic small functions \(a_1(z)\) a 1 ( z ) , \(a_2(z)\) a 2 ( z ) and \(a_3(z)\) a 3 ( z ) CM, where f(z) is a non-constant meromorphic function in \(\mathbb {C}^m\) C m , then either \(f(z) = f(z+c)\) f ( z ) = f ( z + c ) or \(f(z) = f(z+2c)\) f ( z ) = f ( z + 2 c ) , with the latter case arising when \(\limsup \limits _{r\rightarrow \infty }\frac{\log T(r,f)}{r}>0\) lim sup r log T ( r , f ) r > 0 . This extends the result of Heittokangas et al. (Complex Var. Elliptic Equ. 56(1–4):81–92, 2011) for finite order meromorphic function in \(\mathbb {C}\) C to meromorphic functions in higher dimensions. Moreover, we show by plenty of examples that our results are best possible in certain senses.