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Soit un nombre réel positif. Considérons une énergie potentielle de la formeV(x)={0si0≤x≤a;+∞sinon.\begin{equation} V(x) = \left\lbrace \begin{array}{cccc} 0 \; & \; \text{si} \; & 0 \leq x \leq a ; \\ +\infty \; & \; \text{sinon}. & \end{array}\right. \nonumber \end{equation}