Discrete Relations: can't understand relation definition

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SUMMARY

The discussion centers on the definition of a relation S on the set of all integers Z x Z, where (a1, a2)S(b1, b2) is defined by the condition a1b2 = a2b1. This indicates that the ordered pairs (a1, a2) and (b1, b2) are proportional, meaning they maintain the same ratio. The key concepts explored include symmetry, antisymmetry, transitivity, and reflexivity, which are essential for understanding the properties of this relation.

PREREQUISITES
  • Understanding of set theory and ordered pairs
  • Familiarity with the concepts of symmetry, antisymmetry, transitivity, and reflexivity
  • Basic knowledge of proportional relationships and ratios
  • Ability to work with integer sets and relations
NEXT STEPS
  • Study the properties of relations in depth, focusing on symmetry, antisymmetry, transitivity, and reflexivity
  • Explore examples of proportional relationships in mathematics
  • Learn about equivalence relations and their characteristics
  • Investigate the application of relations in different mathematical contexts, such as linear algebra
USEFUL FOR

Students studying discrete mathematics, particularly those focusing on relations and their properties, as well as educators seeking to clarify these concepts for learners.

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Homework Statement


Let Z be the set of all integers.

Then, S is a relation on the set Z x Z defined by:

for (a1, a2), (b1, b2) belong to Z x Z,

(a1, a2)S(b1, b2) <-> a1b2 = a2b1.


Homework Equations





The Attempt at a Solution


The actual problem is about symmetry, antisymmetry, transitivity, and reflexivity. I get all of those concepts. What I don't understand is,

What does (a1, a2)S(b1, b2) mean?


Thank you for any help.
 
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If anyone has anything close to an idea of what this could mean.. Please help. I just need a good guess so I can try the question, but I don't have a clue.
 
S is the symbol for the relation. For example, (1, 2)S(2, 4) because 1*4 = 2*2. In this case the relation is that two ordered pairs are proportional. You could think of the ordered pairs as ratios: 1 is to 2 in the same ratio as 2 is to 4.
 

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