The Arithmetic, algebra and geometry, therefore, are constituted of mere ' ' relations of idias' '. Established the meanings of the numbers, for example, we get for mere rational analysis that three times five are the half of thirty, and all the other proposals of this sort, proposal this treated substantially on the beginning of not-contradiction. This knowledge of relation of ideas independe of the facts and not in the ones of the news information, therefore, the same consist of establishing relations between the ideas that are part of the affirmation or a thought. Whereas the data in fact never will be able to imply a contradiction, the opposite of data is always possible in fact any, the same ones is conceived by the mind with the same easiness and the same distinction as if the reality was extremely in agreement, therefore, it is based on the sensible and proportionate experience for our impressions. The critical examination of David Hume exactly is based on the relation between cause and effect. For the same, all the reasonings that say respect to the reality of the facts seem established in the cause relation and effect, thus we only can exceed the evidence of our memory and the directions.

All effect depends, to exist, of a cause. The causal relation forms one of the main axles of the humiano empirismo, being this responsible relation for the joint of the registers of the memory and exerts an essential paper for proper constitution of the experience. From the impressions or ideas gifts in our memory we form a type of system, understanding what it wants that let us remember in them that it has been present to our felt perceptions or. Therefore, the causal relation allows us to go beyond the immediate data of the directions and the registers of the memory making to infer the existence of that it is not given in them.