Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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### Algebraic and Transcendental Numbers

A real number \( s \) that is irrational is called **algebraic** if it is the root of a polynomial equation with integer coefficients. For example, \( s = \sqrt{2} \) is algebraic since it is a root of \( x^2 - 2 = 0 \). Numbers that are irrational but not algebraic are called **transcendental**.

#### Exercises:

**(a) Show that the set of all algebraic numbers is countable.**
- **Hint**: Show that there are countably many polynomials with integer coefficients. You may assume that a polynomial of degree \( n \) has \( n \) roots. You may also assume class theorems, and that if \( A \) is a countable set, then for \( n \geq 1 \), the set of \( n \)-tuples of elements of \( A \), \( A^n = \{ (a_1, a_2, ..., a_n) : \text{each } a_j \in A \} \) is also countable.

**(b) Show that the set of all transcendental numbers is uncountable.**
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Transcribed Image Text:### Algebraic and Transcendental Numbers A real number \( s \) that is irrational is called **algebraic** if it is the root of a polynomial equation with integer coefficients. For example, \( s = \sqrt{2} \) is algebraic since it is a root of \( x^2 - 2 = 0 \). Numbers that are irrational but not algebraic are called **transcendental**. #### Exercises: **(a) Show that the set of all algebraic numbers is countable.** - **Hint**: Show that there are countably many polynomials with integer coefficients. You may assume that a polynomial of degree \( n \) has \( n \) roots. You may also assume class theorems, and that if \( A \) is a countable set, then for \( n \geq 1 \), the set of \( n \)-tuples of elements of \( A \), \( A^n = \{ (a_1, a_2, ..., a_n) : \text{each } a_j \in A \} \) is also countable. **(b) Show that the set of all transcendental numbers is uncountable.**
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