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