f(gcd/2)

Documentation
- Reference manual
  - Built-in Predicates
    - Arithmetic
      - General purpose arithmetic
        
        Arithmetic Functions
        
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- Packages

Availability:Arithmetic function (see is/2)

gcd(+IntExpr1, +IntExpr2)

Result is the greatest common divisor of IntExpr1 and IntExpr2. The GCD is always a positive integer. If either expression evaluates to zero the GCD is the result of the other expression.