Math Problem Statement

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Let R be defined on R by (x, y) ∈ R if |x − y| ≤ 1. Then the relation R is: (a) transitive but not symmetric (b) symmetric but not transitive (c) both transitive and symmetric (d) neither transitive nor symmetric

Solution

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extracted_textThe image contains a question about a relation RR defined on the set of real numbers R\mathbb{R}. The relation RR is given by:

(x,y)R if xy<1(x, y) \in R \text{ if } |xy| < 1

The task is to determine whether the relation RR is:

  1. Transitive but not symmetric
  2. Symmetric but not transitive
  3. Both transitive and symmetric
  4. Neither transitive nor symmetric

Solution

Symmetry:

A relation is symmetric if for every pair (x,y)R(x, y) \in R, it also holds that (y,x)R(y, x) \in R.

For RR, we are given that xy<1|xy| < 1. If (x,y)R(x, y) \in R, then xy<1|xy| < 1, and since multiplication is commutative (i.e., xy=yxxy = yx), it follows that yx=xy|yx| = |xy|. Hence, if (x,y)R(x, y) \in R, then (y,x)R(y, x) \in R as well.

Thus, the relation is symmetric.

Transitivity:

A relation is transitive if whenever (x,y)R(x, y) \in R and (y,z)R(y, z) \in R, it also holds that (x,z)R(x, z) \in R.

Let's analyze the transitivity condition. We have (x,y)R(x, y) \in R and (y,z)R(y, z) \in R, which means:

xy<1andyz<1|xy| < 1 \quad \text{and} \quad |yz| < 1

We need to check whether this implies xz<1|xz| < 1.

Consider specific values: let x=0.5x = 0.5, y=0.5y = 0.5, and z=0.5z = 0.5. We have:

xy=0.5×0.5=0.25<1andyz=0.5×0.5=0.25<1|xy| = |0.5 \times 0.5| = 0.25 < 1 \quad \text{and} \quad |yz| = |0.5 \times 0.5| = 0.25 < 1

But for (x,z)(x, z):

xz=0.5×0.5=0.25<1|xz| = |0.5 \times 0.5| = 0.25 < 1

However, if we take larger values like x=1x = 1, y=0.5y = 0.5, and z=1z = 1, we get:

xy=1×0.5=0.5<1andyz=0.5×1=0.5<1|xy| = |1 \times 0.5| = 0.5 < 1 \quad \text{and} \quad |yz| = |0.5 \times 1| = 0.5 < 1

But for xz|xz|:

xz=1×1=1(not less than 1)|xz| = |1 \times 1| = 1 \quad \text{(not less than 1)}

This counterexample shows that the relation is not transitive.

Conclusion:

The correct answer is:

(b) Symmetric but not transitive.


Would you like further clarification or details on how transitivity is checked? Let me know if you have any questions!

Additional Questions:

  1. What does symmetry mean in the context of relations?
  2. Can you provide another example of a relation that is symmetric but not transitive?
  3. What other properties can a relation have, besides symmetry and transitivity?
  4. How can we prove whether a relation is transitive using different examples?
  5. What are some real-world scenarios where such relations might arise?

Tip: Always test a few specific cases when checking properties like transitivity, as counterexamples can often provide clear insight into whether the property holds.

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Math Problem Analysis

Mathematical Concepts

Relations
Symmetry
Transitivity

Formulas

|x - y| ≤ 1

Theorems

Definition of symmetric and transitive relations

Suitable Grade Level

Grades 10-12