In arguing for the existence of the link, the contents of the personal theorem, i.e. "proof of object" are used. The theorem of causality is divided into two types: simple and complex. Compound Helia theorem is also divided into two categories, and in this argument, we use those compound helia in which the presence of the predicate is outside the existence of the subject. In this type of cases, there is something called "proportion".  Relation is one of the literal meanings, and it is the link between the subject and the predicate. The existence of a relationship in this type of case does not need to be proven, but it is enough to refer to conscience and knowledge to confirm it. But the fact that ratio is a literal concept requires reasoning. If we say that ratio is a nominal concept, sequence and impossibility are necessary. So ratio is a literal concept. We went through one stage of reasoning, and that was proving the existence of a link in the world of mind and concepts; But the final stage and the main purpose of the philosopher is to prove the existence of the connection in the outside world. At this stage, we say that the true external compound heliats are consistent with all the external components; Therefore, the relationship between the subject and the predicate also corresponds to the outside and has its own special example.