proposition that his dog stole the sausages. For each person A, one can define a (partial) function CA mapping the set of propositions to the closed interval [0, 1] by stipulating that for a proposition P CA(P)=t if and only if C has a degree of belief t in the proposition P. Ramsey and de Finetti independently attempted to show that if A is rational, CA is a probability function: that is, CA satisfies the standard (Kolmogorov) probability axioms. They supposed that when one describes an event as having probability P, one really is voicing one's degrees of belief. Probabilities are not real features of the world. For example, when saying that the event that the coin lands heads up has probability ½, one does so because one's degree of belief in the proposition that the coin will land heads up is ½. A counter-argument would be that: "This needs to be restated to show probability in a particular number of flips, not one coin flip, which DOES only have a probability of 1/2 since it only has two sides". This argument is moot, as the probability of the coin either landing on a heads or tails is 1, however, the observer is unable to accurately measure the input variables contributing to the output condition. Thus, in the projectivist view, probability is a measure of the degree to which an observer believes in a given proposition of the outcome of an event. See also Subjectivism Philosophy of perception Moral philosophy References External links Philosophy of Color Vision Metaphysics of mind Meta-ethics