LOGICAL TYPES (THEORY of) 3)
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The theory of logical types was established by B. RUSSELL and A.N. WHITEHEAD in their "PRINCIPIA MATHEMATICA".
G. BATESON synthesized it as follows: "… the theory asserts that no class can, in formal logic or mathematical discourse, be a member of itself; that a class of classes cannot be one of the classes which are its members; that a name is not the thing named…" (1973, p.250).
As expressed by G. BATESON (1979, p.229): "A series of examples is in order:
1. The name is not the thing named but is of different logical type, higher than that of the thing named.
2. The class is of a different logical type, higher than that of its members.
3. The injunction issued by, or control emanating from, the bias of the house thermostat is of higher logical type that the control issued by the thermometer. (The bias is the device on the wall that can be set to determine the temperature around which the temperature of the house will vary).
4. The word "tumbleweed" is of the same logical type as "bush" or "tree ". It is not the name of a species or genus of plants; rather, it is the name of a class of plants, whose members share a particular style of growth and dissemination.
5. Acceleration is of a higher logical type than velocity"
The theory of logical types was established in order to eliminate logical paradoxes whose best known example is the assertion by EPIMENIDES the Cretan that all Cretans are liars, a self-contradictory statement.
In R.von MISES words: "It constitutes the first step toward a general rational conceptual structure and discards old pseudo problems".
It has an obvious relation to Gödel's incompleteness theorem, and far from having only abstract bearings, it is very useful to clear logico-semantic muddles and many innocently or artfully distorted pseudo-logical arguments, for example in psychology.(1973, p.250 – 279).
It is a necessary tool for the establishment of hierarchies of isomorphisms in General Systems Research.
Categories
- 1) General information
- 2) Methodology or model
- 3) Epistemology, ontology and semantics
- 4) Human sciences
- 5) Discipline oriented
Publisher
Bertalanffy Center for the Study of Systems Science(2020).
To cite this page, please use the following information:
Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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