Re: Transitive Closure
From: Laconic2 <laconic2_at_comcast.net>
Date: Tue, 18 May 2004 13:49:51 -0400
Message-ID: <-Jidnf4ON5Pk0Tfd4p2dnA_at_comcast.com>
Date: Tue, 18 May 2004 13:49:51 -0400
Message-ID: <-Jidnf4ON5Pk0Tfd4p2dnA_at_comcast.com>
By the way, the "set of attributes" that is one of the operands of a projection reminds me strongly of the "space" that defines the domain of a relational variable.
So much so, that I think of "projection" as simply mapping the operand relation from its current space into a different space. This fits nicely with that "projection" means in projective geometry. Received on Tue May 18 2004 - 19:49:51 CEST