How is this collection called?
From: Mikito Harakiri <mikharakiri_at_iahu.com>
Date: Mon, 29 Mar 2004 15:37:19 -0800
Message-ID: <qA2ac.38$_A3.69_at_news.oracle.com>
Let '*' be binary aggregation operator.
Date: Mon, 29 Mar 2004 15:37:19 -0800
Message-ID: <qA2ac.38$_A3.69_at_news.oracle.com>
Let '*' be binary aggregation operator.
Then, sets obey the following laws:
a*a=a
a*b=b*a
a*(b*c)=(a*b)*c
Bags:
a*a!=a a*b=b*a a*(b*c)=(a*b)*c
Lists:
a*a!=a a*b!=b*a a*(b*c)=(a*b)*c
What collection type meets
a*a!=a
a*b!=b*a
a*(b*c)!=(a*b)*c
? Received on Tue Mar 30 2004 - 01:37:19 CEST