"An information system characterizes a view of the world with which it interacts, and broadly speaking, its input can take two forms; a query or an impetus for change. Physically the information held by an information system might be a diagram, a graph, a spreadsheet, a database, a rulebase, or a more sophisticated cognitive entity. More often than not, information is uncertain and subject to change; this is the case even for simple database systems. Consequently an information system requires a mechanism for modifying its view as more information about the world is acquired."
– Mary-Anne Williams. Tutorial: Belief Revision: Modeling The Dynamics Of Information Systems, 1995.
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The Wageningen University & Research Library Catalogue contains a.o. the titles of the books and journals held by the participating libraries. Journal articles are not included in this database. Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.
Footnote numbering is maintained as in the original text -- as a result, page numbers are also noted for where the footnote originally appears. Some minor typographical errors remain in the1931 edition which are corrected here: - - Page 169, line 19, we replaced "intensities fo feelings" with "intensities of feelings" Page 176, line 22 we replaced "few asumptions as possible" with "few assumptions as possible" - - Page 187, line 12, we replaced "objective interpetation" with "objective interpretation" Page 191, Footnote 1, we replaced "guided only be ratiocination" with "guided only by ratiocination". Keynes's symbolism p/h meaning the probability of proposition p given proposition h. "Truth and Probability" written 1926. CONTENTS (1) The Frequency Theory (2) Mr Keynes' Theory (3) Degrees of Belief (4) The Logic of Consistency (5) The Logic of Truth (1) THE FREQUENCY THEORY In the hope of avoiding some purely verbal controversies, I propose to begin by making some admissions in favour of the frequency theory.