From: <jos.deroo.jd@belgium.agfa.com>

Date: Thu, 16 Aug 2001 18:09:58 +0100

To: phayes@ai.uwf.edu

Cc: w3c-rdfcore-wg@w3.org

Message-Id: <OFD1DBA542.1D57BC3E-ON41256AAA.005ABA2A@bayer-ag.com>

Date: Thu, 16 Aug 2001 18:09:58 +0100

To: phayes@ai.uwf.edu

Cc: w3c-rdfcore-wg@w3.org

Message-Id: <OFD1DBA542.1D57BC3E-ON41256AAA.005ABA2A@bayer-ag.com>

[It's even better now with the exercises, so let's try] [...] > Exercise: Calculate the truthvalues of the triples > c a c > b b b > c b a > in this interpretation. c a c false b b b false c b a true > More advanced exercise: Write six distinct triples in > this vocabulary and define another interpretation which > makes three of them true and the other three false. six distinct triples (true in the given interpretation) a b c b b c c b b a a c c a a c a b and the interpretation IR={1,2}; IP={1} IEXT:1->{<1,2>} IS:a->1,b->1,c->2 gives only true triples a b c b b c a a c [...] > Exercise: Consider the RDF graph defined by the following triples: > _:x a b > c b _:x > _:x a c > > Is this graph true or false in the interpretation given in the > previous exercise? false (triple 1 and triple 3 can not be both true) > How about the graphs formed from just the first triple, and from > just the last two triples? both true -- Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/Received on Thursday, 16 August 2001 12:10:28 UTC

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