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CS2148
Relations Outside of Sets

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RandomAccess Posts: 101	Posted 19:00 Jan 28, 2018 \| In the exercise, specifically problem 16 part a, it asks you to determine whether the relations are true based on the rules in relation V, that (x - y)/4 is an integer. One of them is (-2)V(-6). When we plug in the rule we indeed find out that the result is 1, which is an integer making the relation true. However the problem I have is that -6 isn't an element in the co-domain provided. So my question is, are we just determining whether these numbers fit the relation, or do they have to be elements in the domain and co-domain as well? Last edited by RandomAccess at 19:01 Jan 28, 2018.
dchou4 Posts: 4	Posted 22:42 Jan 28, 2018 \| I believe its false, he did a similar example in class. The relation is for all (x,y) is element G X H. (-2,-6) is not a element of GXH

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RandomAccess

Posts: 101

Posted 19:00 Jan 28, 2018 |

In the exercise, specifically problem 16 part a, it asks you to determine whether the relations are true based on the rules in relation V, that (x - y)/4 is an integer. One of them is (-2)V(-6). When we plug in the rule we indeed find out that the result is 1, which is an integer making the relation true. However the problem I have is that -6 isn't an element in the co-domain provided. So my question is, are we just determining whether these numbers fit the relation, or do they have to be elements in the domain and co-domain as well?

Last edited by RandomAccess at 19:01 Jan 28, 2018.

dchou4

Posts: 4

Posted 22:42 Jan 28, 2018 |

I believe its false, he did a similar example in class. The relation is for all (x,y) is element G X H. (-2,-6) is not a element of GXH