The cross-product is not to be confused with the Cartesian product, which is related to the (in this case unfortunately named) "cross join" in SQL. Cross produc

The cross-product is not to be confused with the Cartesian product, which is related to the (in this case unfortunately named) "cross join" in SQL. Cross products operate in ℝ³, while Cartesian products are just defined over sets. The standard List monad instance uses the latter.