Euler Done by: Mohammed Ahmed20120023 Noor Taher Hubail20113636 Zahra Yousif 20113682 Zainab Moh’d Ali20110932 TC2MA324 - History of Mathematics.

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Euler Done by: Mohammed Ahmed Noor Taher Hubail Zahra Yousif Zainab Moh’d Ali TC2MA324 - History of Mathematics

General information One of math's most pioneering thinkers. Establishing a career as an academy scholar and contributing greatly to the fields of geometry, trigonometry and calculus. He released hundreds of articles and publications during his lifetime, and continued to publish after losing his sight. Name: Leonhard Euler Born: on April 15, 1707, in Basel, Switzerland Died: September 18, 1783 He Was

Mathematical notation: Mathematical notation: Introduced the: ―The modern notation for the trigonometric functions, ―The Greek letter for summations. ―The letter “i” to denote the imaginary unit. ―The use of the Greek letter to denote the ratio of a circle's circumference to its diameter. Analysis: Analysis: ―He is well known in analysis for his frequent use and development of power series, such as ―Discovered the power series expansions for e and the inverse tangent function. ―Introduced the use of the exponential function and logarithms in analytic proofs. The Contributions

Number theory: Number theory: He proved: ―Newton's identities ―Fermat's little theorem ―Fermat's theorem on sums of two squares. Applied mathematics: Applied mathematics: ―He developed tools that made it easier to apply calculus to physical ―problems, ―Euler's method and the Euler-Maclaurin formula. The Contributions

Relatively primes are numbers that are “do not contain any factor in common with” ( Wolfarm MathWorld (n.d.). Totient function. Retrieved March 31, 2015, from: Totient Function: Concepts

“The relatively primes of a given number are called totatives” ( Wolfarm MathWorld (n.d.). Totient function. Retrieved March 31, 2015, from: or coprimes.

Totient Function: Concepts

Other Names of Totient Function Euler’s Totient Function Phi Function Euler’s Function

numbers coprime (totatives) to n , 2 421,3 541,2,3,4 621,5 761,2,3,4,5,6 841,3,5,7

Totient Function: Prime Numbers Could you come up with a formula for finding the totient function of prime number?

Totient Function: Exponoents

Totient Function: Exponents

Proof

Proof

Totient Function: Multiplicative Property

Euler phi function’s examples When n is a prime number (e.g. 2, 3, 5, 7, 11, 13), φ(n) = n-1. φ(5) = 5-1= 4 When m and n are coprime, φ(m*n) = φ(m)*φ(n). φ(15) = φ(5*3) = φ(5)*φ(3) = 4 * 2 = 8 φ(9) = φ(3²), = 3² - 3^1 = 6

Euler phi function’s exercises φ(4) φ(35) φ(11) φ(100) φ(22) QuestionsAnswers

Reference: Euler's Totient Function and Euler's Theorem. Retrieved from: Whitman College. 3.8 The Euler Phi Fuction. Retrieved from: ne/section03.08.html ne/section03.08.html Wolfarm MathWorld. Totient function. Retrieved from: Lapin, s. ( 2008, march 20 ) Leonhard Paul Euler: his life and his works. Retrieved from tations/Euler.pdf tations/Euler.pdf