Re: [ontolog-forum] PROF Swartz ON DEFINITIONS

[FERENC KOVACS <f.kovacs@xxxxxxxxxxxxxx>]

Rich

Re: How about

 

If     _x is an ancestor of _z

And _z is the father of _y

Or   _z is the mother of _y

Then _x is an ancestor of _y.  

 

The basis relations include:

_ is the father of _

_ is the mother of _

 

And the term defined with recursion, is

_ is an ancestor of _

 

Each expansion of the Horne clause during the query must be instantiated with some variable or constant in order to continue expanding the search backward.  If at any point, the database runs out of father and mother facts, then recursion stops.  But that fact doesn’t show up in FOL as clearly as in the software function that interprets it, and which must specifically figure out how to stop the recursion when there is no more fodder for the query.  

 

Sounds like Ceterum censeo

Regards,

Ferenc

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