To understand how signs work in Peirce’s theory of triadic sign relations, also known as “semiotics”, we have to understand, in order of increasing generality, sign relations, triadic relations, and relations in general, all as conceived in Peirce’s logic of relative terms and the corresponding mathematics of relations.

Toward that understanding, here are versions of articles I long ago contributed to Wikipedia and have more lately developed at a number of other places.

• Sign Relations
• Triadic Relations
• Relation Theory

cc: Ontolog Forum • Peirce List