1. Felix Klein to David Hilbert, December 6, 1894. (Frei (ed.) 1985, 115).
2. Cf. Rowe 2003a.
3. Cf. Corry 2003, §§ 1.2 & 2.2.4; Schappacher & Volkert 1991. DHN504 contains the notes taken by Hilbert at a rather high-level course on number thenry given by Weber in SS 1 RR2
4. Cf. Siebert 1966.
5. Filed as DHN506, 507–508, 511, 512, 513, 515, respectively.