Up tack
The up tack or falsum (⊥, \bot in LaTeX, U+22A5 in Unicode[1]) is a constant symbol used to represent:
- The bottom element in lattice theory
- The bottom type in type theory
- A logical constant denoting contradiction in logic (false)
The glyph of the up tack appears as an upside-down tee symbol, and as such is sometimes called eet (the word "tee" in reverse).
The tee (⊤), also called down tack, plays a complementary or dual role in many of these theories.
The similar-looking perpendicular symbol (⟂, \perp in LaTeX, U+27C2 in Unicode) is a binary relation symbol used to represent:
- Perpendicularity of lines in geometry
- Orthogonality in linear algebra
- Independence of random variables in probability theory
- Comparability in order theory
- Coprimality in number theory
See also
Notes
- ↑ "Mathematical Operators – Unicode" (PDF). Retrieved 2013-07-20.
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