This article provides an informal introduction to several core ideas. ...

In semiotics, a sign relational complex is a generalization of a sign relation that allows for empty components in the elementary sign relations, or sign relational triples of the form (object, sign, interpretant). Gene rally speaking, when it comes to things that are being contemplated as ostensible or potential signs of other things, neither the existence nor the uniqueness... ...

This article develops the theory of relations in regard to its specifically combinatorial aspects. ...