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Lauricella's theorem : ウィキペディア英語版 | Lauricella's theorem In the theory of orthogonal functions, Lauricella's theorem provides a condition for checking the closure of a set of orthogonal functions, namely: ''Theorem.'' A necessary and sufficient condition that a normal orthogonal set be closed is that the formal series for each function of a known closed normal orthogonal set in terms of converge in the mean to that function. The theorem was proved by Giuseppe Lauricella in 1912. ==References==
*G. Lauricella: ''Sulla chiusura dei sistemi di funzioni ortogonali'', Rendiconti dei Lincei, Series 5, Vol. 21 (1912), pp. 675–85.
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