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Alexandria

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Lettris

Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.

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English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).

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# Intégrale elliptique

Une fonction intégrale elliptique est une fonction f de la forme :

$x \mapsto f(x) = \int_{c}^{x} R\left(t,\sqrt{P(t)}\right)\;\mathrm dt$

R est une fonction rationnelle à deux variables, P est une fonction polynomiale de degré 3 ou 4 avec des racines simples et c est une constante.

Legendre a montré qu'on pouvait distinguer trois espèces de fonctions elliptiques notées $E,F,\Pi$. Les intégrales elliptiques « complètes » de première espèce donnent le périmètre d'une ellipse, ce qui justifie en partie le nom d'intégrales elliptiques. Les intégrales elliptiques sont les applications réciproques des fonctions elliptiques.