Math 2.0

Mathematical logic and foundations Concept

Proposition

Summary

A proposition is a statement that is either true or false. In classical logic, each proposition has exactly one of the two truth values, true or false. For example, "2+2=42 + 2 = 4" is a true proposition, and "77 is even" is a false proposition. A question or a command is not a proposition, because it has no truth value.

Remarks

Letters such as pp, qq and rr usually denote propositions. An open sentence such as "x>3x > 3" is not a proposition until xx has a value. It is a predicate. The connectives negation, conjunction and disjunction make new propositions from given propositions.

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Further reading

  1. Web https://en.wikipedia.org/wiki/Proposition, lead section
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