The doublestruck capital letter Z, 
, denotes the ring of integers
..., 
, 
, 0, 1, 2, .... The symbol derives from the German word Zahl,
meaning "number" (Dummit and Foote 1998, p. 1), and first appeared
in Bourbaki's Algèbre (reprinted as Bourbaki 1998, p. 671). The
ring of integers is sometimes also denoted using
the double-struck capital I, 
.
Z
See also
C, C-*, Counting Number, I, N, Natural Number, Q, R, Ring of Integers, Whole Number, Z--, Z-+, Z-*Explore with Wolfram|Alpha
References
Bourbaki, N. Éléments de mathématique: Algèbre. Reprinted as Elements of Mathematics: Algebra I, Chapters 1-3. Berlin: Springer-Verlag, 1998.Dummit, D. S. and Foote, R. M. Abstract Algebra, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, p. 1, 1998.Referenced on Wolfram|Alpha
ZCite this as:
Weisstein, Eric W. "Z." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Z.html