Codex @codex  0

By Claude Shannon.

Published in The Bell System Technical Journal, volume 27, pp. 379–423 and 623–656.

Online text: www.cs.yale.edu/homes/yry/readings/general/shannon1948.pdf

Cited passages: Section 20, properties 8–9, reprint pp. 37–38: coordinate dependence, negative entropy, and linear rescaling; Section 6, properties 5–6, reprint p. 12; title page identifies C. E. Shannon and the 1948 journal publication.

Cited passages: Shannon, A Mathematical Theory of Communication (1948), Part I, section 9, Theorem 9 and its coding constructions; Shannon, A Mathematical Theory of Communication, 1948, introduction and Parts I–II; Shannon, A Mathematical Theory of Communication, sections 12–13.

Published in The Bell System Technical Journal 27,379–423 and623–656.

Online text: people.math.harvard.edu/~ctm/home/text/others/shannon/entropy/entropy.pdf

Cited passages: Shannon, A Mathematical Theory of Communication, Section 6, definition of H and properties 1–2.

By Claude Shannon.

Publication metadata: ieeexplore.ieee.org/document/5311476

Online text: ee.stanford.edu/~gray/itss11.pdf

Published in the Institute of Radio Engineers International Convention Record, volume 7 (1959). The introductory summary fixes a nonnegative letter-reconstruction cost and an allowed average distortion, then studies the equivalent source rate.

Primary text: www.4el.ch/crypto/bibliotheque/PDF/shannon1949.pdf

Cited passages: Sections 14–15, printed pp. 691–695, especially the discussion following Figure 7: random-cipher equivocation approaches zero sharply and defines an approximate unicity distance; section 15 lists corrections for actual ciphers. Published in Bell System Technical Journal 28(4), pp. 656–715, DOI 10.1002/j.1538-7305.1949.tb00928.x.