4 5 2 D O C U M E N T 5 2 4 M A Y 1 9 2 9 524. To Michele Besso [Berlin-Charlottenburg, 10 May 1929][1] Dear Michele, Your card worries me. What is oppressing you? Were you able to use my little scribbling?[2] With warm regards, your A. E.    h s   h s   h s   –   h t  = h t     h t   h t   – =    h s h s   h s   –   =   h s   h s    h s h s   h s  –    h s h s   h s   –   D  G 2   0  D  ( H 2   (H   ) / ) – 0  h s h s   h s h s   –   i  lm   ilm -  i   lm  -  i   lm  1 2 -- S i   i –     lm  ilm S lm   m l  l m – –  ilm | 1 2 --S  i  lm  + 1 2 -- i   m l  l m S lm  – +   + S       1 2 S        / =       1 2 --S  i  lm  i  S lm     i   m l ) + – S    / = S     + S  /  /  [2] [3] [3]