Solved: Prove or disprove that there is a rational number
Chapter 1, Problem 1.7.11(choose chapter or problem)
Prove or disprove that there is a rational number x and an irrational number y such that xY is irrational.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer