If a person does not believe P, where P is some proposition, is it fair to say

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If a person does not believe P, where P is some proposition, is it fair to say that they then positively believe not-P?

Here's an example to help make the question concrete:

Let P be "It is raining."

I don't believe that it is raining. However it does not follow that I believe that it is not raining. (I don't have any beliefs about raining at the moment.)

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