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direct_product (302B)


      1 # Direct product
      2 
      3 Given [structures] S1 and S2 on same [signature], the *direct product* of S1 and S2 is the [structure] where:
      4 - the [domain] is the [Cartesian_product] of the [domains]
      5 - the [tuples] are the combinations of the [tuples] of S1 and S2
      6 
      7 Up: [operator] on [structure]
      8 
      9 See also: [union]