The set difference 
is defined by
Here, the backslash symbol is defined as Unicode U+2216.
The set difference is therefore equivalent to the complement set, and is implemented in the Wolfram
Language as Complement[A,
B].
The symbol 
is sometimes also used to denote a set difference (Smith et al. 1997, p. 68).
See also
Backslash,
Complement Set,
Difference Set,
Symmetric
Difference
Explore with Wolfram|Alpha
References
Croft, H. T.; Falconer, K. J.; and Guy, R. K. Unsolved
Problems in Geometry. New York: Springer-Verlag, p. 2, 1991.Harris,
J. W. and Stocker, H. Handbook
of Mathematics and Computational Science. New York: Springer-Verlag, p. 3,
1998.Smith, D.; Eggen, M.; and St. Andre, R. A
Transition to Advanced Mathematics, 4th ed. New York: Brooks/Cole, 1997.Referenced
on Wolfram|Alpha
Set Difference
Cite this as:
Weisstein, Eric W. "Set Difference." From
MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SetDifference.html
Subject classifications
