Claude Shannon

American mathematician and electrical engineer (1916–2001), the founder of information theory: his 1948 "A Mathematical Theory of Communication" defined the bit, gave channel capacity its precise meaning, and set the mathematical limits of what a communication channel can carry. As a graduate student he had already shown (his 1937 MIT master's thesis) that Boolean algebra could describe electrical switching circuits — the result that made digital logic design a mathematics — and in 1950, with E. F. Moore, he built the first Hex-playing machine, an analog device that read its move off the saddle point of an electric potential field rather than by search.

In this vault Shannon is a hub not because any one capture leaned on him, but because the whole-file view shows him load-bearing across several otherwise disconnected clusters — the cross-cluster case a per-capture entity-candidate step cannot weigh (the same reason entity-frederic-bartlett earned a page). He is the direct subject/builder in the Hex/analog-computing thread; the named conversational stimulus for Nash's 1952 RAND game-machines report in the RAND game-theory thread; and, in a genuinely separate source community, the framework-originator whose information theory Miller (1956) imports into psychophysics and whose "channel capacity" the Admiralty-Code source-rating lineage descends from. His switching-circuit logic is the modern anchor of the Jevons logic-machine lineage, and "(Shannon) information of the activations" is a reference point in the deep-net critical-periods / Information-Bottleneck debate. Only the machine (Hex) note treats him as the subject of its claim; the rest are his ideas being imported by others — which is exactly what a foundational figure's footprint looks like, and why the flood-averse per-capture writers kept holding him back one mention at a time.

References

Hex / analog computing / game theory (subject or named actor)

• claim-shannon-moore-1950-analog-hex-machine-move-as-saddle-point — the 1950 analog Hex machine; Shannon (with E. F. Moore) as its builder, the one note where he is the claim's subject
• claim-nash-1952-rand-report-names-williams-shannon-not-isaacs-or-blackwell — Nash's own D-1164 credits "a very interesting conversation with Claude Shannon" as its stimulus
• claim-isaacs-rand-colleagues-nash-blackwell-confirmed-overlap — the only contemporaries Nash's report names are J. D. Williams and Shannon (a negative-finding leg)
• claim-nash-hex-first-player-win-proof-is-non-constructive — the Shannon–Moore machine as the physical-solution pole against Nash's non-constructive proof
• claim-nash-1952-rand-report-confirms-hex-proof-non-constructive — D-1164 sibling in the Hex cluster
• claim-gale-1979-hex-draw-impossibility-equivalent-to-brouwer-fixed-point — the Shannon–Moore machine listed among the vault's Hex-solving methods
• claim-gale-1979-hex-implies-brouwer-via-covering-argument — same, the reverse-implication sibling

Information theory imported into other fields (framework-originator)

• claim-miller-1956-channel-capacity-limits-absolute-judgment-categories — Miller imports Shannon's information theory into psychophysics; "the channel capacity of the observer"
• observation-admiralty-code-scale-length-descends-from-millers-channel-capacity — the Miller → Bendig → Samet rating-scale lineage that runs back to Shannon's channel capacity
• claim-oaksford-chater-recast-wason-task-as-optimal-data-selection — reasoning recast as maximizing Shannon-entropy reduction
• claim-critical-periods-fim-signal-does-not-correlate-with-ib-compression-signal — the Achille/Soatto FIM vs. "(Shannon) information of the activations" distinction in the IB debate
• claim-deutsch-nerves-of-government-founding-political-cybernetics-text — Deutsch applying Wiener's and Shannon's feedback / channel-capacity concepts to political systems

Switching-circuit logic / logic machines

• claim-jevons-logic-piano-1869-mechanical-inference-machine — the Peirce–Marquand–Shannon line; Shannon's 1937 thesis made switching-circuit logic canonical

Bell Labs adjacency (background, not load-bearing)

• claim-1961-daisy-bell-first-synthesized-computer-song — Shannon and the Kelly criterion named as "a separate thread from the same room"