What it means
The tenth Greek letter. κ stands for the curvature of a curve, the condition number of a matrix, Cohen's kappa for agreement between raters, and thermal conductivity in some books.
Read aloud in real formulas
κ(A) = ‖A‖ ‖A⁻¹‖
Aethel says
kappa of A equals the norm of A, times the norm of A inverse
the condition number of a matrix
κ = 1/r
Aethel says
kappa equals 1 over r
the curvature of a circle of radius r
Typing it
- LaTeX
- \kappa (capital: K)
- Unicode
- U+03BA, U+039A
Questions
How do you pronounce kappa (κ)?
It is said “kappa”, roughly KAP-uh.
What does κ mean in maths?
The tenth Greek letter. κ stands for the curvature of a curve, the condition number of a matrix, Cohen's kappa for agreement between raters, and thermal conductivity in some books.
How do you type κ?
In LaTeX, write \kappa (capital: K). Its Unicode code point is U+03BA, U+039A.