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Excerpt from Sur les Équations de la Gravitation d'Einstein
La recherche des équations de la gravitation revient donc à la recherche de toutes les formes différentielles quadratiques cova riantes egm. Dxldxk. Einstein ajoute deux conditions supplémen taires la première que les l soient linéaires par rapport aux dérivées partielles du second ordre des fonctions g, - k, la seconde que la loi de conservation soit respectée.
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