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 "On 's Theory of gravitation." By Prof..

I.

(Communicated in the meeting of February 26, 1916).

§ 1. In pursuance of his important researches on gravitation has recently attained the aim which he had constantly kept in view; he has succeeded in establishing equations whose form is not changed by an arbitrarily chosen change of the system of coordinates. Shortly afterwards, working out an idea that had been expressed already in one of 's papers, has shown the use that may be made of a variation law that may be regarded as 's principle in a suitably generalized form. By these results the "general theory of relativity" may be said to have taken a definitive form, though much remains still to be done in further