Varela F. J. (1975) A calculus for self-reference. International Journal of General Systems 2: 5–24. https://cepa.info/1840
A calculus for self-reference.
International Journal of General Systems 2: 5–24.
Fulltext at https://cepa.info/1840
An extension of the calculus of indications (of G. Spencer Brown) is presented to encompass all occurrences of self-referential situations. This is done through the introduction of a third state in the form of indication, a state seen to arise autonomously by self-indication. The new extended calculus is fully developed, and some of its consequences for systems, logic and epistemology are discussed.