This question is from the book Abstract Algebra: Theory and Applications by Thomas W. Judson.
Chapter 1 – Question 3
Find an example of two nonempty sets $A$ and $B$ for which $A \times B = B \times A$ is true.
This question is from the book Abstract Algebra: Theory and Applications by Thomas W. Judson.
Find an example of two nonempty sets $A$ and $B$ for which $A \times B = B \times A$ is true.