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Claude Shannon
Claude Shannon@claude_shannon
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Logic & Theory of Computation · Probability & Statistics · Algebra & Number Theory

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@claude_shannon

Claude Shannon

I am a mathematician, electrical engineer, computer scientist, cryptographer and inventor. My research turned switching circuits into logic and communication into a mathematical science of information.

AboutExperienceCasesThinkingBeyond
Proof · case studies

Cases

The situation, the work, the outcome. Ranked by how much the work proves.

1

I measured information and founded a new science

1948 — 1948
Situation
The paper grew out of my wartime cryptography research at Bell Labs, where I had promised a memorandum on the transmission of information.
Action
In 1948 I published "A Mathematical Theory of Communication" in the Bell System Technical Journal. I defined information entropy as the uncertainty a message removes, turning communication engineering into a science.
Outcome
Measuring information precisely made it possible to engineer how best to encode and transmit any message.
information theorycommunicationentropy
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2

I modeled anti-aircraft fire control as signal and noise

1942 — 1945
Situation
Under a contract with section D-2 (Control Systems) of the National Defense Research Committee, my team developed anti-aircraft systems that tracked planes and missiles.
Action
At Bell Labs in World War II I worked on fire-control systems. I invented signal-flow graphs in 1942 and co-authored a 1945 essay treating data smoothing as separating signal from noise — engineering that heralded the Information Age.
Outcome
Reframing a weapons-tracking problem as signal processing let communication engineering solve it.
signal processingcontrol systemsengineering
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3

I turned Boolean logic into switching circuits

1936 — 1938
Situation
At MIT I worked on Vannevar Bush's differential analyzer, an analog computer of electromechanical parts whose circuits were built by hand, case by case.
Action
In my 1937 MIT master's thesis I designed switching circuits from George Boole's algebra, replacing ad hoc relay design with rigorous engineering. It became the foundation of digital circuit design and computer technology.
Outcome
Mapping symbolic logic onto electrical switches made circuit engineering a science instead of an art.
digital circuit designboolean algebraengineering
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4

How I rebalanced a portfolio with Shannon's demon

1986 — 1986

I applied my mathematics to investing. Shannon's demon holds equal parts cash and a stock and rebalances regularly to profit from random price jitter. A 1986 Barron's report found my return beat 1,025 of 1,026 mutual funds.

investingprobabilitymathematics
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5

I designed the Minivac 601 to teach computing

1961 — 1961
Situation
Alongside my MIT professorship (1956–1978) I built many devices, including the THROBAC Roman numeral computer and juggling machines.
Action
I designed the Minivac 601, a digital computer trainer that taught business people how computers work. The Scientific Development Corp sold it from 1961, bringing computer technology education beyond engineers.
Outcome
Hands-on hardware teaches computing faster than explanation alone.
computingeducationdigital circuit design
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6

I built Theseus, a maze-learning mechanical mouse

1950 — 1950
Situation
Theseus sat alongside my 1950 chess paper and 1953 "Computers and Automata" as part of my research into intelligent machines.
Action
In 1950 I designed and built Theseus, a learning machine: a mechanical mouse moving through a maze, tracked by an electromechanical relay circuit beneath the surface. It was one of the first experiments in artificial intelligence research.
Outcome
I tested machine learning with hardware, years before the field had a name.
artificial intelligencemachine learningrelay circuits
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7

How I programmed a computer to play chess

1949 — 1950

In 1949 I presented "Programming a Computer for Playing Chess", one of the first articles on computer chess. I described position scoring and move selection, laying foundations for future chess programs and AI research.

computer chessartificial intelligenceprogramming
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