Re: header part of the value?

On 28 feb, 04:32, Tegiri Nenashi <TegiriNena..._at_gmail.com> wrote:
> On Feb 27, 7:08 pm, Marshall <marshall.spi..._at_gmail.com> wrote:
>
> > It appears to me as if you are viewing the
> > equation "x + 3 = y" as having 3 as the free variable, and
> > x and y as constants! Whereas I would consider it much
> > more natural to consider x and y as free variables, or
> > parameters, or attribute names (they are all the same)
> > and 3 and 5 as constants.
>
> Well, the case with two variables in the header is tricky. First,
> define union and join then we can talk about it:-)

How about: the union is the logical disjunction of the equations and the join is the logical conjunction of the equations?

• Jan Hidders