| On munit {E\!=\!\mathbb{R}_{n}[X]} de {\left({P}\!\mid\!{Q}\right)\!\!=\!\!\!\displaystyle\int_{0}^{1}\!\!t^{2}PQ}
On pose également : {\forall P\in E,\;u(P)\!=\!X(1\!-\!X)P''\!+\!(3\!-\!4X)P'}
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| On munit {E\!=\!\mathbb{R}_{n}[X]} de {\left({P}\!\mid\!{Q}\right)\!\!=\!\!\!\displaystyle\int_{0}^{1}\!\!t^{2}PQ}
On pose également : {\forall P\in E,\;u(P)\!=\!X(1\!-\!X)P''\!+\!(3\!-\!4X)P'}
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