| Summary: | Is information a real entity, or is it only a useful mathematical notion? Shannon’s equation and a consolidated tradition have led many scientists and laymen to consider information as some kind of physical, additive quantity. The very well-known argument in favour of information as a physical quantity has not reached any definitive conclusion. Much has been derived from Shannon’s formula, which was introduced to provide a convenient logarithmic measure that might be practically useful and close to most intuitive feelings. Shannon never insisted on the ontological status of information, which might be revealed to be a lot less committing than is often believed. The bottom line is that information might be a convenient mathematical notation to express the probability of independent configurations in a system.
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