GCD[, , ... ] gives the greatest common divisor of the integers .
Integer mathematical function (see Section A.3.10).
GCD[, ... ] gives the integer factors common to all the .
GCD also works with rational numbers; GCD[, , ... ] gives the greatest rational number r for which all the /r are integers. See The Mathematica Book on the web: Section 3.2.4. See also: PolynomialGCD, Rational, LCM, ExtendedGCD.
GCD[
, 
, ... ] gives the greatest common divisor of the integers 
. 
, ... ] gives the integer factors common to all the 
. 
, 
, ... ] gives the greatest rational number r for which all the 
/r are integers. 