This operator (made using a greater-than sign '>' and a less-than
sign '<') returns the list whose elements form the Cartesian product
of L_1,...,L_n. For the N-fold product of a list with itself, one may
use 'Tuples'.
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L := [1,2,3];
L >< ["a","b"] >< [5];
[[1, "a", 5], [1, "b", 5], [2, "a", 5], [2, "b", 5], [3, "a", 5], [3, "b", 5]]
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ChessBoard := (1..8)><(1..8); -- Need brackets around 1..8 otherwise
-- we get a parse error.
Note that only '<>' is used for 'not equal' in CoCoA.
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