What do you mean by "holes"?

On Thu, Jan 23, 2014 at 2:42 AM, YKY (Yan King Yin, 甄景贤) <
[email protected]> wrote:

> ​There is no royal road...  we have to spell out more details:
>
> 1. Consequence operator can be broken down to single steps:
>     Cn(F) = lim
> n →∞
> ​,  ​
> St​ⁿ(F)
>
> 2. Each single step is the set union of the results of individual rules r
> ∈ R:
>     St(F) = ⋃ r(F)
>
> ​3. A single rule is of the form:
>     head → tail
> and it performs, for all facts f ∈ F:
>     r(F) = tail * { sub | head * sub ​= f }
> ​where "x * sub" means substituting sub into formula x.  The { | } is set
> comprehension.
>
> The last equation says to find all subs such that head * sub equals a fact
> ∈ F.  That is unification.
>
> What remains to do is to find a spatial interpretation of the act of
> substitution, *.  That depends on how to represent "formulas with holes",
> which is predicate logic.  For example, "father(X,Y)" is a formula with 2
> holes.
>
> If we can represent such "predicated" (or "quantified") formulas in space,
> then we can spatialize substitution etc...
>
> More later =)
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