Continued Fractions and their application to solving Pell's equations
Continued Fractions and their application to
solving Pell¡¯s equations
Number Theory: Fall 2009
Peter Khoury
University of Massachusetts-Boston, MA
Gerard D.Ko?
University of Massachusetts-Boston, MA
Number Theory: Fall 2009
University of Massachusetts Boston
Outline
1
2
3
4
Pell¡¯s Equation and History
Problems Involving Pell¡¯s Equation
Continued Fractions
Solving Pell¡¯s Equations
Number Theory: Fall 2009
University of Massachusetts Boston
Pell¡¯s Equation and History
Pell¡¯s Equation
The quadratic Diophantine equation of the form
x 2 ? dy 2 = ¡À1
where d is a positive square free integer is called a Pell¡¯s equation.
Number Theory: Fall 2009
University of Massachusetts Boston
Pell¡¯s Equation and History
Pell¡¯s Equation
The quadratic Diophantine equation of the form
x 2 ? dy 2 = ¡À1
where d is a positive square free integer is called a Pell¡¯s equation.
In this presentation, we focus separately on the equations of the
form
x 2 ? dy 2 = 1 and x 2 ? dy 2 = ?1.
Number Theory: Fall 2009
University of Massachusetts Boston
Pell¡¯s Equation and History
Pell¡¯s Equation
The quadratic Diophantine equation of the form
x 2 ? dy 2 = ¡À1
where d is a positive square free integer is called a Pell¡¯s equation.
In this presentation, we focus separately on the equations of the
form
x 2 ? dy 2 = 1 and x 2 ? dy 2 = ?1.
The name Pell¡¯s equation comes from Euler who in a letter to
Goldbach confused the name of William Brouncker, the ?rst
mathematician who gave an algorithm to solve the equation, with
that of the English mathematician John Pell(1 March 1611-12
December 1685).
Number Theory: Fall 2009
University of Massachusetts Boston
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