SWI-Prolog -- (,)/2

Documentation
- Reference manual
  - Built-in Predicates
    - Control Predicates
      - fail/0
      - false/0
      - true/0
      - repeat/0
      - !/0
      - ,/2
      - ;/2
      - |/2
      - ->/2
      - *->/2
      - \+/1
- Packages

Availability:built-in

[ISO]:Goal1 , :Goal2

Conjunction. True if both‘Goal1' and‘Goal2' can be proved. It is defined as follows (this definition does not lead to a loop as the second comma is handled by the compiler):

Goal1, Goal2 :- Goal1, Goal2.