Re: operators for relations in sets
- To: mathgroup at smc.vnet.net
- Subject: [mg60351] Re: [mg60338] operators for relations in sets
- From: "David Park" <djmp at earthlink.net>
- Date: Wed, 14 Sep 2005 03:27:18 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
SubsetEqual is an 'operator' that has no predefined definition. But you
could make a definition, something like the following:
SubsetEqual[set1_List, set2_List] := Union[set1, set2] === set1
SubsetEqual[{1}, {1}]
True
SubsetEqual[{1, 2, 5, 7}, {5, 7, 7, 2, 1}]
True
SubsetEqual[{1, 2, 3}, {2, 4, 7}]
False
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: hawkmoon269 [mailto:rson at new.rr.com]
To: mathgroup at smc.vnet.net
I'm having some difficulty understanding the behaviour of the operators
for relations in sets in Mathematica. For instance,
TrueQ[{1}\[SubsetEqual]{1}]
returns
False
I'm not getting what's going on here...
h