- algebraic semantics
- Boolean domain
- classical logic
- Degrees of truth
- False dilemma
- fuzzy logic
- global element
- Heyting algebra
- Intuitionistic logic
- logic
- Logical connective
- Logical truth
- mathematics
- Multi-valued logic
- Negation
- proposition
- relevance logic
- Slingshot argument
- subobject classifier
- Supervaluationism
- Topos theory
- truth
- two-valued logic


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- Agnosticism
- algebraic semantics
- Boolean domain
- classical logic
- Degrees of truth
- False dilemma
- fuzzy logic
- global element
- Heyting algebra
- Intuitionistic logic
- logic
- Logical connective
- Logical truth
- mathematics
- Multi-valued logic
- Negation
- proposition
- relevance logic
- Slingshot argument
- subobject classifier
- Supervaluationism
- Topos theory
- truth
- two-valued logic
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In classical logic, with its intended semantics, the truth values are true and false; that is, classical logic is a two-valued logic. Intuitionistic logic lacks a complete set of truth values because its semantics, the Brouwer–Heyting–Kolmogorov interpretation, is specified in terms of provability conditions, and not directly in terms of the truth of formulae. Multi-valued logics (such as fuzzy logic and relevance logic) allow for more than two truth values, possibly containing some internal structure.
Even non-truth-valuational logics can associate values with logical formulae, as is done in algebraic semantics. For example, the algebraic semantics of intuitionistic logic is given in terms of Heyting algebras.
Topos theory uses truth values in a special sense: the truth values of a topos are the global elements of the subobject classifier. Having truth values in this sense does not make a logic truth valuational.
See also
External links
ar:قيمة الحقيقة ca:Valor de veritat cs:Pravdivostní hodnota de:Wahrheitswert es:Valor de verdad fr:Valeur de vérité ko:진리값 it:Valore di verità he:ערך אמת mk:Вистинитосна вредност nl:Waarheidswaarde ja:真理値 pl:Wartość logiczna pt:Valor de verdade simple:Truth value fi:Totuusarvo th:ค่าความจริง uk:Значення істинності zh:真值
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