2 7 6 D O C U M E N T 2 7 9 O C T O B E R 1 9 2 8 the other hand, the task of promoting and developing inventions falls to the state, which is accompanied by other dangers: stagnation as a result of complacency, bu- reaucracy, politics, and envy. 8) In a free economy, percentage profit sharing and potential conferment of an appropriate executive position, or a position in which he can make use of his spe- cific skills. The same for a planned economy, but instead of profit sharing, partial or complete exemption from other kinds of obligatory work. 9) An attempt at the answer to this question would be overconfidence. Refine- ment of the established is also, by the way, the job of the inventor. 10) Progressive organization and specialization of work gradually allows the su- perior talent of some to once again recede into the background vis-à-vis decent av- erage talent. 279. From Leopold Infeld Warsaw, 4 October 1928 Dear Professor, I would be very grateful to you if you would allow me to make the following remarks concerning your paper “Riemannian Geometry Retaining… etc.:”[1] The geometry you developed there is a special case of non-Riemannian geome- try, and as such it is treated in the book by L. P. Eisenhart, Non-Riemannian Geom- etry, pp. 47–50.[2] This special case is characterized by the equations (1) , (2) . It follows from (1) that (3) . This equation holds both for the symmetry that you developed, as well as for the geometry that I have chosen,[3] since for both, (1) is fulfilled and the asymmetry of the is maintained. Respectfully yours, L. Infeld g ik   l 0 = K ikl m 0 =                     + +   1 2 + =   