Tee (symbol)
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The tee (⊤, \top in LaTeX), also called down tack (as opposed to the up tack) or verum, is a symbol used to represent:
- The top element in lattice theory.
- The truth value of being true in logic, or a sentence (e.g., formula in propositional calculus) which is unconditionally true.[1][2][3] By definition, every tautology is logically equivalent to the verum.
- The top type in type theory.
- Mixed radix encoding in the APL programming language.
- A lowered phonic in the International Phonetic Alphabet and phonetics. In this usage, it is usually written under the primary IPA symbol.
A similar-looking superscript T may be used to mean the transpose of a matrix.
Encoding
In Unicode, the tee character is encoded as U+22A4 ⊤ DOWN TACK (HTML ⊤).[4] The symbol is encoded in LaTeX as \top.
A large variant is encoded as U+27D9 ⟙ LARGE DOWN TACK (HTML ⟙) in the Unicode block Miscellaneous Mathematical Symbols-A.
See also
Notes
- ↑ "tautology | Definition & Facts" (in en). https://www.britannica.com/topic/tautology.
- ↑ "Definition of TAUTOLOGY" (in en). https://www.merriam-webster.com/dictionary/tautology.
- ↑ Weisstein, Eric W.. "Tautology" (in en). https://mathworld.wolfram.com/Tautology.html.
- ↑ "Mathematical Operators – Unicode". https://www.unicode.org/charts/PDF/U2200.pdf. Retrieved 2013-07-20.
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