7 8 D O C U M E N T 4 7 M A Y 1 9 2 3
Mit freundl. Grüssen
Mileva.
ALS. [144 370]. There are perforations for a loose-leaf binder at the left margin of the document.
[1]Einstein possibly sent Doc. 23 to Mileva’s former address in Zurich and gave his Berlin resi-
dence as the return address. The letter was then returned to Berlin and forwarded to Leyden by Ilse
Einstein. By that time, Einstein had left Leyden and Paul Ehrenfest readdressed the letter.
[2]Einstein had expressed his views on the taxation and investment of his Nobel Prize money in
Doc. 23.
[3]See their Divorce Decree, 14 February 1919 (Vol. 9, Doc. 6).
47. To Walter Loewenheim
Berlin, den 28. V.
23.[1]
q bezw. –q = Geschwindigkeiten der β-Teilchen gegenüber dem System
K[2]
Gegenüber K′ sind die Geschwindigkeiten gemäss der Lorentz-Transformation
1. Teilchen: 2. Teilchen:
In unserem Fall ist , also
1. Teilchen
2. Teilchen =
Der Bruch in der letzten Klammer liegt zwischen 0 und 1, also die Klammer zwi-
schen –1 und 0, also der ganze Ausdruck zwischen –c und 0. Ihr Fehler liegt darin,
q′
q v
1
qv
c2
----- -–
-------------- -= q′
q v
1
qv
c2
----- -+
--------------- -=
v q =
q′
q q
1
qv
c2
----- -–
-------------- - 0 = =
–2q
1
q2
c2
---- -+
-------------- - c--------------
2--
q
c
-–
1
q2
c2
---- -+
- = c--------------------------------
2--
q
c
-–
1

c
-+--¹
§
2
2--
q
c
-
- c--------------------------------
1

c
-+--¹
§
2
4--
q
c
-
- 1 =
c 1
1
q2·
c2
----¹ -+
§
2--
q
c
-–
1
q2
c2
---- -+
-------------------------------- - +=
1
c
-–--¹·q