| Project/Area Number |
16540179
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Basic analysis
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| Research Institution | Nagasaki Institute of Applied Science |
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Principal Investigator |
KAJIKIYA Ryuji Nagasaki Institute of Applied Science, Faculty of Engineering, Professor (10183261)
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| Project Period (FY) |
2004 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,710,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | elliptic equation / variational method / multiple solutions / sublinear ellintic equation / p-Laplace equation / bifurcation of solution / 特異係数関数 / 無限大ラプラシアン / 放物型方程式 / 解の漸近挙動 / 半線形楕円型方程式 / 比較定理 / variational method / symmetric mountain pass lemma / 偶汎関数 |
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| Research Abstract |
We discover a new critical point theorem related to the symmetric mountain pass lemma. Our theorem asserts that an even functional on a Banach space has a sequence of critical points converging to zero. By applying it to a sublinear elliptic equation, we prove the existence of infinitely many solutions under a very weak condition.
When the, nonlinear term is not odd, we prove that a sublinear elliptic equation has infinitely many solutions. By considering the Lagrangian functional associated with the elliptic equation as a perturbation from an even functional, we use the symmetry of the functional to prove the existence of solutions. The existence of multiple solutions has been studied for the superlinear elliptic equations. However, little is known about the multiple solutions of the sublinear elliptic equations except for our results.
We prove the regularity of solutions for one-dimensional p-Laplace equations with singular coefficients. By using it, we give a necessary and sufficient condition for the existence of eigenvalues. Then we investigate the structure of the bifurcation of solutions for the one-dimensional p-Laplace equations. Moreover, by using the number of zeros of solutions, we study the direction of the bifurcation branch and show the global existence of the bifurcation curve.
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