Hmm. On further thought, I'm still confused. I just posted to
https://github.com/opencog/atomspace/issues/977 but I will repost here,
because it seems important:
Aren't the following two equivalent?
ImplicationScopeLink
VariableNode x
P(x)
Q(x)
and
ForAllLink
VariableNode x
ImplicationLink
P(x)
Q(x)
If these two are NOT equivalent, then how are they different? If they are
equivalent, do we really need to have an ImplicationScopeLink?
--linas
On Mon, Nov 7, 2016 at 2:40 PM, linas <[email protected]> wrote:
>
> OK, I just got to the bottom of this email chain, and it looks OK to me.
>
> BTW, you may want to keep this in mind: the FreeLink is just a device to
> "memoize" the locations of variables in an expression. Thus, if you have
> an algorithm that needs to repeatedly search for variables in some link
> type, then it can be useful to inherit from FreeLink, -- this helps avoid
> the repeated search. The FreeLink has no additional semantics: it doesn't
> change the meaning of anything.
>
> --linas
>
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