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A paper presented Monday September 30, 2002, by Jan Kåhre at Seminar in Information Theory and its Applications, University of Copenhagen, Department of Mathematics. Arranged by Peter Harremoës, invitation by Flemming Topsøe.

The presentation was made with 16 transparencies and spoken comments now added as text beside the figures:

It's a mathematical theory: The Mathematical Theory of Information is a deductive theory built upon one powerful postulate, The Law of Diminishing Information.

It's a theory about information: The explanation why the postulate defines and describes the concept "information" is found in Chapter 1,

Section 1.7 The Ideal Receiver

Section 1.8 The Law of Diminishing Information

and will not be discussed here.

Contact: jankahre (at)