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

Date: Mon, 23 Jul 2001 20:40:30 +0100

To: bwm@hplb.hpl.hp.com

Cc: w3c-rdfcore-wg@w3.org

Message-Id: <OF2D886BCC.A6C80DC6-ON41256A92.006B4F2A@bayer-ag.com>

Date: Mon, 23 Jul 2001 20:40:30 +0100

To: bwm@hplb.hpl.hp.com

Cc: w3c-rdfcore-wg@w3.org

Message-Id: <OF2D886BCC.A6C80DC6-ON41256A92.006B4F2A@bayer-ag.com>

[a correction after some holiday biking] > > A mapping IEXT : P -> R x R // R cross R > > Isn't the notation f: A -> B used for a function with > domain A and range B? > But IEXT is not a funtion at all, it is a relation on > a cross product R x R which is simply a subset of R x R > IEXT(I(p)) = {<I(s),I(o)> el R x R: I(s) I(p) I(o) is true} I was wrong, IEXT is indeed a function but it's range seems to be the set of all subsets of R x R (including the empty set?) -- Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/Received on Monday, 23 July 2001 14:43:01 UTC

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