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\\begin{equation}\\label{Ec::cf} u(a)=u(b)=u\"(a)=u\"(b)=0\\,. \\end{equation}\n  So, we define the following space:\n  \\begin{equation}\\label{Ec::esp}\n  X=\\left\\lbrace u\\in C^4(I)\\quad\\mid\\quad u(a)=u(b)=u\"(a)=u\"(b)=0 \\right\\rbrace \\,.\n  \\end{equation}\n  Here $p_1\\in C^3(I)$ and $p_2\\in C^2(I)$.\n  By assuming that the second order 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