# Learn Real Analysis from Terence Tao's Book: Download the Pdf for Free and Solve 13 Challenging Questions

## Terence Tao Analysis 1 Pdf Free 13 question piece patis

If you are interested in learning real analysis, one of the best books you can find is Analysis I by Terence Tao. This book covers all the major topics of analysis in a simple, lucid, and rigorous manner. It also provides many exercises and proofs that challenge and enhance your understanding of the subject. In this article, we will show you how to get the pdf version of this book for free, how to use it effectively, and how to solve some of the most interesting questions in the book.

## Terence Tao Analysis 1 Pdf Free 13 question piece patis

## Introduction

### Who is Terence Tao?

Terence Tao is an Australian mathematician who is widely regarded as one of the greatest living mathematicians. He has made significant contributions to various fields of mathematics, such as harmonic analysis, partial differential equations, combinatorics, number theory, and more. He has won many prestigious awards, such as the Fields Medal, the MacArthur Fellowship, the Breakthrough Prize in Mathematics, and the Crafoord Prize. He is currently a professor of mathematics at UCLA and has written several books and papers on various topics.

### What is Analysis 1?

Analysis I is a textbook on real analysis written by Terence Tao. It is intended for senior undergraduate students of mathematics who have already been exposed to calculus. The book discusses the basics of analysis, such as the construction of the number systems, set theory, limits, series, continuity, differentiation, integration, and more. The book also has appendices on mathematical logic and the decimal system. The book is part of a two-volume series, with Analysis II covering topics such as metric spaces, topology, Fourier analysis, and Lebesgue integration.

### Why is it important to learn real analysis?

Real analysis is one of the core branches of mathematics that studies the properties and behavior of real numbers, functions, sequences, series, limits, continuity, differentiation, integration, and more. It provides the foundation for many other areas of mathematics and applications in science and engineering. Learning real analysis helps you develop logical thinking, abstract reasoning, and rigorous proof skills. It also helps you appreciate the beauty and elegance of mathematics.

## How to get the pdf for free?

### Download from SpringerLink

One of the easiest ways to get the pdf version of Analysis I for free is to download it from SpringerLink. SpringerLink is a platform that provides access to millions of books and journals in various disciplines. You can find the book by searching for its title or ISBN (978-981-10-1789-6) on the website. You can also use this link: __https://link.springer.com/book/10.1007/978-981-10-1789-6__. You can download the entire book or individual chapters as pdf files. You can also read the book online or print it for personal use.

### Download from Google Sheets

Another way to get the pdf version of Analysis I for free is to download it from Google Sheets. Google Sheets is a web-based spreadsheet application that allows you to create and edit spreadsheets online. You can find the pdf file of the book by searching for its title or author on Google Sheets. You can also use this link: __https://docs.google.com/viewer?a=v&pid=sites&srcid=aGNtdXMuZWR1LnZufGxraGF8Z3g6NDVlODAwYjVlYTg1YzhjYg__. You can download the pdf file or view it online. You can also copy and paste the content into a new spreadsheet or document.

### Download from other sources

There are also other sources where you can get the pdf version of Analysis I for free, such as library websites, academic websites, torrent sites, etc. However, you should be careful about the quality and legality of these sources. Some of them may have incomplete, corrupted, or pirated copies of the book. Some of them may also contain viruses, malware, or spyware that can harm your computer or device. Therefore, you should always check the credibility and reputation of these sources before downloading anything from them.

## How to use the pdf effectively?

### Read the preface and introduction carefully

Before you start reading the book, you should read the preface and introduction carefully. These sections will give you an overview of the book's purpose, scope, structure, style, and prerequisites. They will also give you some tips and advice on how to study the book effectively. For example, you will learn that the book is divided into 11 chapters, each covering a major topic of analysis. You will also learn that the book is deeply intertwined with the exercises, as it is intended that you actively learn the material by proving several of the key results in the theory.

### Follow the exercises and proofs step by step

One of the best ways to use the book effectively is to follow the exercises and proofs step by step. The book provides many exercises and proofs that challenge and enhance your understanding of the subject. You should try to solve the exercises and understand the proofs on your own before looking at the solutions or hints. You should also check your answers and reasoning carefully and compare them with the ones given in the book or online. This will help you develop logical thinking, abstract reasoning, and rigorous proof skills.

### Review the main concepts and results regularly

Another way to use the book effectively is to review the main concepts and results regularly. The book covers a lot of material and it is easy to forget some of the details or get confused by some of the notation or terminology. Therefore, you should review the main concepts and results regularly to reinforce your memory and understanding. You can use various methods to review, such as making notes, flashcards, summaries, diagrams, etc. You can also use online resources, such as videos, podcasts, blogs, etc., to supplement your review.

## What are the 13 questions and how to solve them?

### Question 1: Prove that there is no largest natural number

To prove that there is no largest natural number, we can use a method called proof by contradiction. This method involves assuming that the opposite of what we want to prove is true and then showing that this leads to a contradiction or absurdity.

### Question 2: Prove that every natural number has a unique prime factorization

To prove that every natural number has a unique prime factorization, we can use a method called induction. This method involves proving that a statement is true for a base case (usually the smallest or simplest case) and then showing that if it is true for any case, it is also true for the next case.

So let us prove that every natural number n > 1 has a unique prime factorization. The base case is n = 2, which is already a prime number and has a unique prime factorization of 2. Now suppose that the statement is true for some natural number k > 1, that is, k has a unique prime factorization of p1^a1 * p2^a2 * ... * pm^am, where p1, p2, ..., pm are distinct prime numbers and a1, a2, ..., am are positive integers. We want to show that the statement is also true for k+1.

There are two possibilities for k+1: either it is a prime number or it is not. If it is a prime number, then it has a unique prime factorization of k+1. If it is not a prime number, then it must have at least one prime divisor q. Then we can write k+1 = q * r, where r is another natural number. By the induction hypothesis, r has a unique prime factorization of q1^b1 * q2^b2 * ... * qn^bn, where q1, q2, ..., qn are distinct prime numbers and b1, b2, ..., bn are positive integers. Then we can write the prime factorization of k+1 as q * q1^b1 * q2^b2 * ... * qn^bn. This factorization is unique because if there were another factorization of k+1 as p1^c1 * p2^c2 * ... * pm^cm, where p1, p2, ..., pm are distinct prime numbers and c1, c2, ..., cm are positive integers, then we would have q = p1 or q = p2 or ... or q = pm by the fundamental theorem of arithmetic. But this would imply that k+1 has two different prime divisors, which contradicts our assumption that q is the only prime divisor of k+1. Therefore, k+1 has a unique prime factorization.

By induction, we have proved that every natural number n > 1 has a unique prime factorization.

### Question 3: Prove that there are infinitely many prime numbers

To prove that there are infinitely many prime numbers, we can use a method called proof by contradiction. This method involves assuming that the opposite of what we want to prove is true and then showing that this leads to a contradiction or absurdity.

So let us assume that there are only finitely many prime numbers p1, p2, ..., pn. Then we can form a new natural number N by multiplying all these primes and adding one: N = p1 * p2 * ... * pn + 1. Then N must have at least one prime divisor q. But then q must be equal to one of the primes p1, p2, ..., pn by the fundamental theorem of arithmetic. But then q divides both N and p1 * p2 * ... * pn, which implies that q also divides N - p1 * p2 * ... * pn = 1. But this is impossible because no prime number can divide 1. Therefore, our assumption must be false and there are infinitely many prime numbers.

### Question 4: Prove that the set of rational numbers is countable

To prove that the set of rational numbers is countable, we can use a method called diagonalization. This method involves arranging the elements of the set in an infinite table and then listing them in a diagonal order.

So let us consider the set of rational numbers Q = a/b : a and b are integers and b 0. We can arrange them in an infinite table as follows:

0 0 0 0 ... --- --- --- --- --- --- 0 0/1 -0/1 0/-1 -0/-1 ... 0 1/1 -1/1 1/-1 -1/-1 ... 0 2/1 -2/1 2/-1 -2/-1 ... 0 3/1 -3/1 3/-1 -3/-1 ... ... ... ... ... ... ... We can then list the elements of Q in a diagonal order as follows:

Q = 0/1, 1/1, -0/1, 0/-1, -1/1, 2/1, -2/1, 1/-1, -0/-1, -1/-1, 3/1, -3/1, 2/-1, -2/-1, 3/-1, -3/-1, ... --- This shows that we can assign a natural number to each element of Q and vice versa. Therefore, Q is countable.

### Question 5: Prove that the set of real numbers is uncountable

To prove that the set of real numbers is uncountable, we can use a method called Cantor's diagonal argument. This method involves assuming that the set is countable and then constructing an element that is not in the set by changing the digits in the diagonal of an infinite table.

So let us assume that the set of real numbers R is countable. Then we can list them in an infinite table as follows:

R = r_0 = d_00.d_01d_02d_03..., r_1 = d_10.d_11d_12d_13..., r_2 = d_20.d_21d_22d_23..., r_3 = d_30.d_31d_32d_33..., ... --- where each d_ij is a digit from 0 to 9. We can then construct a new real number s by changing the digits in the diagonal of the table as follows:

s = d'_0.d'_1d'_2d'_3... --- where each d'_i is a digit from 0 to 9 that is different from d_ii. For example, we can choose d'_i = (d_ii + 1) mod 10. Then s is a real number that is different from every r_i in the table. For example, s differs from r_0 in the first decimal place, from r_1 in the second decimal place, from r_2 in the third decimal place, and so on. This contradicts our assumption that R is countable and that every real number is in the table. Therefore, our assumption must be false and R is uncountable.

### Question 6: Prove that every bounded sequence has a convergent subsequence

To prove that every bounded sequence has a convergent subsequence, we can use a method called Bolzano-Weierstrass theorem. This theorem states that every bounded sequence has a subsequence that converges to some limit in the same bound.

So let us consider a bounded sequence (a_n)_n=0^. This means that there exist two real numbers L and U such that L a_n U for all n. We can divide the interval [L,U] into two equal subintervals [L,(L+U)/2] and [(L+U)/2,U]. Then at least one of these subintervals must contain infinitely many terms of (a_n)_n=0^. We can choose one such subinterval and call it [L_0,U_0]. We can also choose one term of (a_n)_n=0^ that belongs to this subinterval and call it a_n_0. Then we can repeat this process for [L_0,U_0] and obtain another subinterval [L_1,U_1] that contains infinitely many terms of (a_n)_n=0^ and another term a_n_1 that belongs to this subinterval. We can continue this process indefinitely and obtain a sequence of nested subintervals [L_k,U_k] and a sequence of terms (a_n_k)_k=0^ such that:

L L_k a_n_k U_k U for all k

[L_k+1,U_k+1] [L_k,U_k] for all k

n_k < n_k+1 for all k

Then we can claim that (a_n_k)_k=0^ is a subsequence of (a_n)_n=0^ that converges to some limit L* in [L,U]. To prove this, we need to show that for any ε > 0, there exists a natural number K such that a_n_k - L*

a_n_k - L* a_n_k - L_k + L_k - L* U_k - L_k + L_k - L* (U-L)/2^k + L_k - L*

Now we need to show that L_k - L* can be made arbitrarily small as k increases. To do this, we can use the fact that [L_k,U_k] is a nested sequence of closed intervals whose lengths tend to zero. By the nested interval property, this implies that there exists a unique real number L* such that L* [L_k,U_k] for all k. Then we have:

L_k - L* U_k - L_k = (U-L)/2^k

which can be made arbitrarily small as k increases. Therefore, we have proved that a_n_k - L*

### Question 7: Prove that every continuous function on a closed interval is bounded

To prove that every continuous function on a closed interval is bounded, we can use a method called extreme value theorem. This theorem states that every continuous function on a closed interval attains its maximum and minimum values on that interval.

So let us consider a continuous function f on a closed interval [a,b]. By the extreme value theorem, there exist two points c and d in [a,b] such that f(c) f(x) f(d) for all x in [a,b]. Then we can define two real numbers M and m as follows:

M = f(d)

m = f(c)

Then we have m f(x) M for all x in [a,b]. This means that f is bounded by M and m on [a,b]. Therefore, every continuous function on a closed interval is bounded.

### Question 8: Prove that every polynomial function of odd degree has at least one real root

To prove that every polynomial function of odd degree has at least one real root, we can use a method called intermediate value theorem. This theorem states that if a function is continuous on a closed interval and takes different signs at the endpoints of the interval, then it must have at least one zero in the interval.

So let us consider a polynomial function of odd degree p(x) = a_n x^n + a_n-1 x^n-1 + ... + a_1 x + a_0, where n is odd and a_n 0. We want to show that p(x) has at least one real root. To do this, we can consider the limits of p(x) as x tends to positive and negative infinity:

lim_(x+) p(x) = lim_(x+) (a_n x^n + a_n-1 x^n-1 + ... + a_1 x + a_0)

= lim_(x+) (x^n (a_n + a_n-1/x + ... + a_1/x^(n-1) + a_0/x^n))

= lim_(x+) (x^n) * lim_(x+) (a_n + a_n-1/x + ... + a_1/x^(n-1) + a_0/x^n)

= (+) * a_n

= (+) * sign(a_n)

Similarly, we have:

lim_(x-) p(x) = (-) * sign(a_n)

Since n is odd, sign(a_n) is either +1 or -1. This means that p(x) takes different signs as x tends to positive and negative infinity. Therefore, by the intermediate value theorem, there must exist a real number c such that p(c) = 0. This means that c is a real root of p(x). Therefore, every polynomial function of odd degree has at least one real root.

### Question 9: Prove that the derivative of a constant function is zero

To prove that the derivative of a constant function is zero, we can use the definition of the derivative. The derivative of a function f at a point x is defined as:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

If f is a constant function, then f(x) = c for some constant c and for all x. Then we have:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

= lim_(h0) (c - c)/h

= lim_(h0) 0/h

= 0

Therefore, the derivative of a constant function is zero.

### Question 10: Prove that the derivative of a linear function is its slope

To prove that the derivative of a linear function is its slope, we can use the definition of the derivative. The derivative of a function f at a point x is defined as:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

If f is a linear function, then f(x) = mx + b for some constants m and b and for all x. Then we have:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

= lim_(h0) ((m(x+h) + b) - (mx + b))/h

= lim_(h0) (mh)/h

= lim_(h0) m

= m

### Question 11: Prove that the derivative of a product of two functions is the product of their derivatives plus the product of their functions and their derivatives

To prove that the derivative of a product of two functions is the product of their derivatives plus the product of their functions and their derivatives, we can use the definition of the derivative and some algebraic manipulation. The derivative of a function f at a point x is defined as:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

If f and g are two functions, then their product is another function h defined as h(x) = f(x) * g(x). Then we have:

h'(x) = lim_(h0) (h(x+h) - h(x))/h

= lim_(h0) ((f(x+h) * g(x+h)) - (f(x) * g(x)))/h

= lim_(h0) ((f(x+h) * g(x+h)) - (f(x+h) * g(x)) + (f(x+h) * g(x)) - (f(x) * g(x)))/h

= lim_(h0) (f(x+h) * (g(x+h) - g(x)) + g(x) * (f(x+h) - f(x)))/h

= lim_(h0) (f(x+h)/h * (g(x+h) - g(x)) + g(x)/h * (f(x+h) - f(x)))

= lim_(h0) (f(x+h)/h * lim_(h0) (g(x+h) - g(x))) + lim_(h0) (g(x)/h * lim_(h0) (f(x+h) - f(x)))

= f'(x) * g'(x) + g(x) * f'(x)

Therefore, the derivative of a product of two functions is the product of their derivatives plus the product of their functions and their derivatives.

### Question 12: Prove that the derivative of a quotient of two functions is the quotient of their derivatives minus the quotient of their functions and their derivatives divided by the square of the denominator function

To prove that the derivative of a quotient of two functions is the quotient of their derivatives minus the quotient of their functions and their derivatives divided by the square of the denominator function, we can use the definition of the derivative and some algebraic manipulation. The derivative of a function f at a point x is defined as:

f'(x) = lim_(h0) (f(x+h) - f(x))/h

If f and g are two functions, then their quotient is another function h defined as h(x) = f(x)/g(x). Then we have:

h'(x) = lim_(h0) (h(x+h) - h(x))/h

= lim_(h0) ((f(x+h)/g(x+h)) - (f(x)/g(x)))/h

= lim_(h0) (((f(x+h)*g(x)) - (f(x)*g(x+h)))/(g(x+h)*g(x)))/h

(x+h))/h)/(g(x+h)*g(x))

= lim_(h0) ((f(x+h)/h - f(x)/h) * g(x) - (g(x+h)/h - g(x)/h) * f(x))/(g(x+h)*g(x))

= lim_(h0) ((f(x+h)/h - f(x)/h)/h * lim_(h0) g(x) - (g(x+h)/h - g(x)/h)/h * lim_