ty.
     2.  They do not translate the content of the original tables.

Let me now establish these two claims.

1.  That these "extended or generalized projections",
    Proj&lt;k&gt; : T x U -&gt; B, in this case for k = 1, 2, 3,
    with T being a domain of tables or else their names,
    with U being a domain of row numbers, of a proper sort,
    and where k is a column number, of an appropriate kind,
    go beyond being 2-adic in their arities or valencies --
    I believe this to be clear on the face o