D O C U M E N T 2 4 5 J U LY 1 9 2 8 2 3 7 . Now I set for example , quite arbitrarily, as , that is, among other things, thus I obtain: owing to its validity for also and [this] can be integrated in general as follows: I choose two arbitrary particular solutions of , and set . Then the harmonics , can readily be chosen in such a way that one has: ,[3] and with this, the integration is finished. One can draw various conclusions from the fact that this integration is possible. In regard to the dynamic laws, in my opinion we are seeing exactly the same situ- ation as under the direct equation of state of the earlier theory.[4] Since, however, you have just informed me that you want to follow other paths, I will not anticipate anything further, and remain, with my warmest wishes for your complete recovery and cure, and with best regards from house to house, yours truly, Müntz 245. To Chaim Herman Müntz [Scharbeutz, after 26 July 1928][1] Dear Mr. Müntz, First of all I would like to thank your wife, also on behalf of my wife, quite heart- ily for her detailed information about the house. Because of its many steps, it is not suitable for us, since both my wife and I have heart problems.[2] H   2  2 v x v ------------- H v   2 2  x - v -------------- = H 4  H   H 4  – H  = H 4 0 = H   2  x2 - v ----------- 2H v  x2 - v ----------- 0, = =  4 = A 1 A 2  A 0 = A 3 2 ,–A –A = H 1 H 2 H 3 ( H v   0  = H 1  2 1 x2 ----------- - A 1  H 3  2 3 x2 ----------- -  A 3 = = H 4 0 =