Math Problem Statement

Consider the following mathematical statement: For any integers x and y, if there is some integer d >1 such that d|x and d|y, then x and y are not relatively prime. Translate the sentence into propositional logic. Use the predicates RelPrime(x,y) ( x and y are relatively prime ) and Divisor(d,x,y) ( d|x and d|y ).

Solution

To translate the given mathematical statement into propositional logic using the predicates:

  • RelPrime(x,y)\text{RelPrime}(x,y): xx and yy are relatively prime.
  • Divisor(d,x,y)\text{Divisor}(d,x,y): dd is a divisor of both xx and yy (i.e., dxd \mid x and dyd \mid y).

Given Statement:

"For any integers xx and yy, if there is some integer d>1d > 1 such that dd divides both xx and yy, then xx and yy are not relatively prime."

Logical Translation:

xy(d(d>1Divisor(d,x,y))¬RelPrime(x,y))\forall x \forall y \left( \exists d \left( d > 1 \land \text{Divisor}(d, x, y) \right) \rightarrow \neg \text{RelPrime}(x, y) \right)

Explanation:

  • xy\forall x \forall y: The statement applies to all integers xx and yy.
  • d(d>1Divisor(d,x,y))\exists d \left( d > 1 \land \text{Divisor}(d, x, y) \right): There exists an integer dd greater than 1 that divides both xx and yy.
  • ¬RelPrime(x,y)\rightarrow \neg \text{RelPrime}(x, y): If such a dd exists, then xx and yy are not relatively prime (i.e., they share a common divisor greater than 1).

Would you like me to clarify any part of this?

Related Questions:

  1. How can this statement be expressed in set notation?
  2. What is the contrapositive of this logical statement?
  3. How does this statement relate to the definition of the greatest common divisor?
  4. Can we express the concept of relative primeness using modular arithmetic?
  5. How would we negate this logical statement?

Tip:

The contrapositive of a conditional statement PQP \rightarrow Q is ¬Q¬P\neg Q \rightarrow \neg P, which is always logically equivalent.

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Math Problem Analysis

Mathematical Concepts

Number Theory
Propositional Logic
Divisibility
Relatively Prime Numbers

Formulas

∀x ∀y (∃d (d > 1 ∧ Divisor(d, x, y)) → ¬RelPrime(x, y))

Theorems

Definition of Relatively Prime Numbers
Divisibility Rules

Suitable Grade Level

Undergraduate (Introductory Number Theory or Discrete Mathematics)