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Börje Langefors - Wikipedia
Infological equation
A major achievement of his work is the formulation of the 'infological equation' describing the difference between data and information as follows: I = i(D, S, t)
This is a mathematical expression for the observation, that the information "I" communicated by a set of data to humans in an information system is a function "i" of the data "D", the semantic background "S", and the time interval "t" of the communication