There is a whole symbolic logic "algebra" about the logical relations of sets of things.

Moreover (as we shall see shortly) they can enter into standard logical relations with factual statements.

He maintained that all knowledge was based on either the impressions of the senses or the logical relations of ideas.

The logical relation of the system can be written:

The truth of a sentence, and more interestingly, its logical relation to other sentences, is then evaluated relative to a model.

Entailment, a logical relation between sentences of a formal language.

Thus, we can represent the logical relation as a linear equation:

The pairing of topics that bore no logical relation to one another.

It must respect logical relations between words and some other principles.

The central processing part, on the other hand, takes care of the logical relations between the various contents and inputs and outputs.