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Logical Values and Operator Symbols
What are correct ways to represent logical values and operators in MathML?
✍: FYIcenter.com
Logical values, True and False, are not included in
"ISO 80000-2 Quantities and Units - Mathematics" specifications.
But they commonly represented as ⊤ and ⊥ in
mathematical equations.
True - The logical true value should be expressed with the Down-Tack symbol ⊤ (U+22A4, ⊤ or ⊤).
False - The logical false value should be expressed with the Up-Tack symbol ⊥ (U+22A5, ⊥ or ⊥).
Relational operators should be represented according to "ISO 80000-2 Quantities and Units - Mathematics" specifications. Here are some examples:
And (Conjunction) - The and (conjunction) operation should be expressed with the Logical-And symbol ∧ (U+2227, ∧ or ∧). For example:
<math><mi>⊤</mi><mo>∧</mo><mi>⊥</mi>
<mo>=</mo><mi>⊥</mi></math>
Or (Disjunction) - The or (disjunction) operation should be expressed with the Logical-Or symbol ∨ (U+2228, ∨ or ∨). For example:
<math><mi>⊤</mi><mo>∨</mo><mi>⊥</mi>
<mo>=</mo><mi>⊤</mi></math>
Not (Negation) - The not (negation) operation should be expressed with the Logical-Not symbol ¬ (U+00AC, ¬ or ¬). For example:
<math><mo>¬</mo><mi>⊥</mi>
<mo>=</mo><mi>⊤</mi></math>
2026-10-17, ∼1770🔥, 0💬
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