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 Post subject: Sets and Relation BASICPosted: Sun, 22 Apr 2012 21:11:44 UTC
 S.O.S. Newbie

Joined: Fri, 30 Mar 2012 20:32:55 UTC
Posts: 4
Hi

Let set A={1,2},

and relation R={ (1,2), (2,1),(2,2)}, would this be asymmetric? if not why??

my answer: i think yes, because (2,1) in R and (1,2) in R then (2,2) in R... but i dont know if it is the right thinking.

Or....do you also need (1,1) in R since (1,2) in R and (2,1) in R

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 Post subject: Re: Sets and Relation BASICPosted: Mon, 23 Apr 2012 03:56:37 UTC
 Moderator

Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12097
Location: Austin, TX
GoldenPho wrote:
Hi

Let set A={1,2},

and relation R={ (1,2), (2,1),(2,2)}, would this be asymmetric? if not why??

my answer: i think yes, because (2,1) in R and (1,2) in R then (2,2) in R... but i dont know if it is the right thinking.

Or....do you also need (1,1) in R since (1,2) in R and (2,1) in R

Are you sure you mean asymmetric and not anti-symmetric?

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 Post subject: Re: Sets and Relation BASICPosted: Mon, 23 Apr 2012 04:03:31 UTC
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Joined: Mon, 29 Dec 2008 17:49:32 UTC
Posts: 6006
Location: 127.0.0.1, ::1 (avatar courtesy of UDN)
Shadow wrote:
GoldenPho wrote:
Hi

Let set A={1,2},

and relation R={ (1,2), (2,1),(2,2)}, would this be asymmetric? if not why??

my answer: i think yes, because (2,1) in R and (1,2) in R then (2,2) in R... but i dont know if it is the right thinking.

Or....do you also need (1,1) in R since (1,2) in R and (2,1) in R

Are you sure you mean asymmetric and not anti-symmetric?

Either way it is no, not yes...

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 Post subject: Re: Sets and Relation BASICPosted: Mon, 23 Apr 2012 04:04:13 UTC
 Moderator

Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12097
Location: Austin, TX
outermeasure wrote:
Shadow wrote:
GoldenPho wrote:
Hi

Let set A={1,2},

and relation R={ (1,2), (2,1),(2,2)}, would this be asymmetric? if not why??

my answer: i think yes, because (2,1) in R and (1,2) in R then (2,2) in R... but i dont know if it is the right thinking.

Or....do you also need (1,1) in R since (1,2) in R and (2,1) in R

Are you sure you mean asymmetric and not anti-symmetric?

Either way it is no, not yes...

True, but at least we can fix terminology, as "asymmetric" is not a generally useful thing to know.

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