<p>The goal of this work is to establish new criteria for oscillation of all solutions to a general third-order functional dynamic equation on time scales of the form <Equation ID="Equ23"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="12346_2025_1259_Article_Equ23.gif" Format="GIF" Height="47" Rendition="HTML" Resolution="72" Type="Linedraw" Width="391" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} \left( r_{2}(\nu )\left[ \left( r_{1}(\nu )\left( y^{\Delta }(\nu )\right) ^{\alpha _{1}}\right) ^{\Delta }\right] ^{\alpha _{2}}\right) ^{\Delta }+q(\nu ) y^{\beta }(\tau (\nu ))=0. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msup> <mfenced close=")" open="("> <msub> <mi>r</mi> <mn>2</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>ν</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mfenced close="]" open="["> <msup> <mfenced close=")" open="("> <msub> <mi>r</mi> <mn>1</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>ν</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mfenced close=")" open="("> <msup> <mi>y</mi> <mi mathvariant="normal">Δ</mi> </msup> <mrow> <mo stretchy="false">(</mo> <mi>ν</mi> <mo stretchy="false">)</mo> </mrow> </mfenced> <msub> <mi>α</mi> <mn>1</mn> </msub> </msup> </mfenced> <mi mathvariant="normal">Δ</mi> </msup> </mfenced> <msub> <mi>α</mi> <mn>2</mn> </msub> </msup> </mfenced> <mi mathvariant="normal">Δ</mi> </msup> <mo>+</mo> <mi>q</mi> <mrow> <mo stretchy="false">(</mo> <mi>ν</mi> <mo stretchy="false">)</mo> </mrow> <msup> <mi>y</mi> <mi>β</mi> </msup> <mrow> <mo stretchy="false">(</mo> <mi>τ</mi> <mrow> <mo stretchy="false">(</mo> <mi>ν</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <mn>0</mn> <mo>.</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>The used approach mainly employs comparison principles with first-order dynamic equations and the Riccati-type substitution technique. The results are illustrated by three examples.</p>

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Oscillation criteria for general third-order delay dynamic equations

  • S. R. Grace,
  • I. Jadlovská,
  • G. N. Chhatria

摘要

The goal of this work is to establish new criteria for oscillation of all solutions to a general third-order functional dynamic equation on time scales of the form \(\begin{aligned} \left( r_{2}(\nu )\left[ \left( r_{1}(\nu )\left( y^{\Delta }(\nu )\right) ^{\alpha _{1}}\right) ^{\Delta }\right] ^{\alpha _{2}}\right) ^{\Delta }+q(\nu ) y^{\beta }(\tau (\nu ))=0. \end{aligned}\) r 2 ( ν ) r 1 ( ν ) y Δ ( ν ) α 1 Δ α 2 Δ + q ( ν ) y β ( τ ( ν ) ) = 0 . The used approach mainly employs comparison principles with first-order dynamic equations and the Riccati-type substitution technique. The results are illustrated by three examples.