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Topic: TEMPORAL REASONING with HORN CLAUSES
Replies: 4   Last Post: May 2, 2013 3:45 AM

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Graham Cooper

Posts: 4,227
Registered: 5/20/10
TEMPORAL REASONING with HORN CLAUSES
Posted: May 1, 2013 6:39 PM
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Historical facts only have fleeting truth...

EXIST(time) event(...., at(time))

as opposed to say Mathematical or Physics facts..

ALL(time) is( space , 3D )


which are true predicates at all times.

--------------------------------

finish( 1 , bolt, 100m ) :- olympics(2000)

This HORN CLAUSE says

bolt-finished-1st-inthe-100m

is TRUE on the condition that

its-the-2000-Olympics




--------------------------------

So instead of atomic facts, temporal CLAUSES work just like ordinary
PROLOG CLAUSES.

i.e. Prolog Rules.

Now temporal facts can be explicitly stated as absolute truths.

its-the-2000-Olympics -> bolt-finished-1st-inthe-100m


finish( 1 , bolt, 100m ) <- olympics(2000)

----------------------------------

Say you want to state with predicates that

you were on a plane between certain times...


move( gray, plane, brisbane, sydney )
:- from( 01012013) , to(02012013)

This succinctly expresses that I was on the plane for 1 day.

-------------------------------

The Fleeting Truth of historical facts is just expressed as a
conditional fact.


Herc
--
www.BLoCKPROLOG.com







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