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How can I proove associtivity of natural in relational algebra?

From: Filter911 <filtermedialtd_at_gmail.com>
Date: 21 Nov 2005 11:19:05 -0800
Message-ID: <1132600745.585631.296500@g14g2000cwa.googlegroups.com>

Can someone give me a link for a full proof or something?

Thanks Received on Mon Nov 21 2005 - 13:19:05 CST

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