Universe of discourse

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The term universe of discourse is generally attributed to Augustus De Morgan (1846).  George Boole (1854) defines it in the following manner:

In every discourse, whether of the mind conversing with its own thoughts, or of the individual in his intercourse with others, there is an assumed or expressed limit within which the subjects of its operation are confined. … Now, whatever may be the extent of the field within which all the objects of our discourse are found, that field may properly be termed the universe of discourse. (Boole 1854/1958, p. 42).

References

  • Boole, George (1854/1958), An Investigation of the Laws of Thought on Which are Founded the Mathematical Theories of Logic and Probabilities, Macmillan Publishers, 1854. Reprinted with corrections, Dover Publications, New York, NY, 1958.
  • De Morgan, Augustus (1846), Cambridge Philosophical Transactions, viii, p. 380.

Resources

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Focal nodes

Peer nodes

Logical operators

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Document history

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