Set A consisted of all even natural numbers

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Discussion Overview

The discussion revolves around the intersection of two sets: set A, which consists of all even natural numbers, and set B, which consists of all odd natural numbers. Participants explore the implications of this intersection in the context of set theory.

Discussion Character

  • Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • One participant asserts that the intersection of set A and set B would be the empty set, as no number can be both even and odd.
  • Another participant agrees, explaining that an element must be in both sets to be in the intersection, reinforcing that A and B are disjoint sets.
  • A third participant also confirms that the intersection should be the null set.
  • A later reply expresses concern about a test question that asked for elements in the intersection, suggesting it may have been a typo, while reflecting on their understanding of the sets involved.

Areas of Agreement / Disagreement

Participants generally agree that the intersection of the two sets is the empty set, but there is a note of uncertainty regarding the test question mentioned by one participant.

Contextual Notes

The discussion does not address any potential nuances regarding definitions of natural numbers or the implications of set theory that could affect the interpretation of the intersection.

Caldus
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If set A consisted of all even natural numbers (i.e. 2, 4, 6...) and set B consisted of all odd natural numbers (i.e. 1, 3, 5...), then what is the result set of:

A intersection B

Would it just be the empty set since no two natural numbers can be even and odd?
 
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Yes, exactly. An element is in "A intersect B" if and only if it is in both A and B. There is no integer that is "both" even and odd and so, in this case, A intersect B is empty. That's a very common occurrence. In fact there's a special name for it: the two sets are "disjoint".
 
Yes it should be null set
 
I was kind of nervous when I was taking a test on this material because the question was to list at least three elements that were in the following sets, and one of those following sets was A intersection B. Guess it had to be a typo on the test. Hopefully I didn't read the question wrong. If I remember right, I'm very sure that A and B were natural number sets. Ah well.

Thanks.
 

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