A priori concept
AE critical of Kantian concept of, lviii, 320,
500
AE on in lecture in Buenos Aires, 965
no reason to believe in equality of charges of
electron and proton, 621
Winternitz on, 242
Aardenne, Gijsbert W. van (1888–1983), 257n,
265n, 486n
AE on character of, 394
in love with Tatiana Ehrenfest, 262
Absolute differential calculus, 195
Absorption
not explained by electromagnetic field equa-
tions, 269
role of in dispute between AE and Jordan, 644
Acceleration
absolute meaning of, 127
proportional to force, Galilei on, 725
real definition of, 517
Action principle, 73, 76
Action-at-a-distance, in Mach’s theory, AE on,
517
Adams, Walter (1876–1956), 511, 512, 857a
Adiabatic compression, and entropy of ideal gas,
lxx, 651
Adler, Friedrich (1879–1960), 832a
Adler, Saul (1895–1966), 605n
Adler, Victor, 832a
Aereboe, Friedrich, 181n
Afanassjewa, Catharina (1854–?), 223n
Affine field theory
AE on, xxxvii–xxxix, 84–88, 102, 194–198,
199–201
calculations on, 63, 65, 90
experimental proof of, 138
generalized wave equation, 155
interesting implications, 153
See also Weyl-Eddington theory
Aichi, Keiichi, 849a
Airplane
atmospheric measurements done in, li, 556n,
617
See also Balloon; Boerner, Arno
Alberini, Coriolano (1886–1960), lxxxi, 693
Albert-Lazard, Louise (1884–1934), Winteler-
Einstein on condition of, 596–597
Alexander, Jerome
offers AE political refuge, 898a
requests condensed form of Einstein 1910d,
892a; sent, 898a
Alexander, Samuel, 882a
Allenby, Lord Edmund, 740n
Allgemeine Zeitung, 625; requests permission to
publish Einstein 1924e, 870a
Alliance israelite universelle, 278
Als-Ob
Gesellschaft, Einstein Prize competition of,
844a, 848a
theory, AE on, 887a
INDEX
Page numbers in italics indicate editorial apparatus; page numbers followed by a lowercase
“n” indicate endnotes to Einstein documents; page numbers followed by a lowercase “a”
indicate references to the Calendar of Abstracts. References are collected under the appro-
priate English heading. Certain institutions, organizations, and concepts that have no stan-
dard English translation are listed under their foreign designation (with cross-references
from an English translation). For the meaning of abbreviations, see the List of Abbrevia-
tions. An Index of Citations follows the main index.
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