<p>In this paper, we first deal with a class of neutral evolution equation with delay in ordered Banach space <i>X</i><Equation ID="Equ47"> <EquationSource Format="TEX">\( \frac{\text {d}}{\text {d}t}(z(t)-cz(t-\delta ))+A(z(t)-cz(t-\delta ))=f(t,\ z(t),\ z(t-\tau )),\quad t\in \mathbb {R}, \)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mfrac> <mtext>d</mtext> <mrow> <mtext>d</mtext> <mi>t</mi> </mrow> </mfrac> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mo>-</mo> <mi>c</mi> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo>-</mo> <mi>δ</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> <mo>+</mo> <mi>A</mi> <mrow> <mo stretchy="false">(</mo> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mo>-</mo> <mi>c</mi> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo>-</mo> <mi>δ</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo>,</mo> <mspace width="4pt" /> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> <mspace width="4pt" /> <mi>z</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo>-</mo> <mi>τ</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> <mspace width="1em" /> <mi>t</mi> <mo>∈</mo> <mi mathvariant="double-struck">R</mi> <mo>,</mo> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mid c\mid &lt;1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>∣</mo> <mi>c</mi> <mo>∣</mo> <mo>&lt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>, the constants <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\delta&gt;0, \tau &gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>δ</mi> <mo>&gt;</mo> <mn>0</mn> <mo>,</mo> <mi>τ</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation> are defined as time lags, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(A:\mathcal {D}(A)\subset X\rightarrow X\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>A</mi> <mo>:</mo> <mi mathvariant="script">D</mi> <mo stretchy="false">(</mo> <mi>A</mi> <mo stretchy="false">)</mo> <mo>⊂</mo> <mi>X</mi> <mo stretchy="false">→</mo> <mi>X</mi> </mrow> </math></EquationSource> </InlineEquation> is a closed linear operator and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(-A\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>-</mo> <mi>A</mi> </mrow> </math></EquationSource> </InlineEquation> generates a positive <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(C_{0}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>C</mi> <mn>0</mn> </msub> </math></EquationSource> </InlineEquation>-semigroup <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(T(t)(t\geqslant 0)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>T</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo stretchy="false">(</mo> <mi>t</mi> <mo>⩾</mo> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(f:\mathbb {R}\times X^{2}\rightarrow X\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo>:</mo> <mi mathvariant="double-struck">R</mi> <mo>×</mo> <msup> <mi>X</mi> <mn>2</mn> </msup> <mo stretchy="false">→</mo> <mi>X</mi> </mrow> </math></EquationSource> </InlineEquation> is continuous function which is <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\omega \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ω</mi> </math></EquationSource> </InlineEquation>-periodic in <i>t</i>. Under the assumption that the <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(T(t)(t\geqslant 0)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>T</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo stretchy="false">(</mo> <mi>t</mi> <mo>⩾</mo> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is compact or non-compact, by applying the characteristics of positive operator semigroups, the monotone iterative technique, and the non-compact measurement, we provide important ordered conditions on the nonlinear term <i>f</i> to guarantee that the above equation has <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\(\omega \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ω</mi> </math></EquationSource> </InlineEquation>-periodic solutions and positive periodic solutions. Finally, two example of our main results are presented.</p>

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Monotone iterative technique of periodic solutions for a class of neutral evolution equation with delay

  • Shengbin Yang,
  • Yongxiang Li

摘要

In this paper, we first deal with a class of neutral evolution equation with delay in ordered Banach space X \( \frac{\text {d}}{\text {d}t}(z(t)-cz(t-\delta ))+A(z(t)-cz(t-\delta ))=f(t,\ z(t),\ z(t-\tau )),\quad t\in \mathbb {R}, \) d d t ( z ( t ) - c z ( t - δ ) ) + A ( z ( t ) - c z ( t - δ ) ) = f ( t , z ( t ) , z ( t - τ ) ) , t R , where \(\mid c\mid <1\) c < 1 , the constants \(\delta>0, \tau >0\) δ > 0 , τ > 0 are defined as time lags, \(A:\mathcal {D}(A)\subset X\rightarrow X\) A : D ( A ) X X is a closed linear operator and \(-A\) - A generates a positive \(C_{0}\) C 0 -semigroup \(T(t)(t\geqslant 0)\) T ( t ) ( t 0 ) , and \(f:\mathbb {R}\times X^{2}\rightarrow X\) f : R × X 2 X is continuous function which is \(\omega \) ω -periodic in t. Under the assumption that the \(T(t)(t\geqslant 0)\) T ( t ) ( t 0 ) is compact or non-compact, by applying the characteristics of positive operator semigroups, the monotone iterative technique, and the non-compact measurement, we provide important ordered conditions on the nonlinear term f to guarantee that the above equation has \(\omega \) ω -periodic solutions and positive periodic solutions. Finally, two example of our main results are presented.