A function f : N × N → N is defined by f (m, n) = 2ᵐ−¹(2n − 1). (a) Prove that f is one to one and onto. (b) Show that N × N is denumerable.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter6: Exponential And Logarithmic Functions
Section6.2: Graphs Of Exponential Functions
Problem 52SE: Prove the conjecture made in the previous exercise.
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A function f : N × N → N is defined by f (m, n) = 2ᵐ−¹(2n − 1).
(a) Prove that f is one to one and onto.
(b) Show that N × N is denumerable.

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