Directory: Top/Science/Math/Number_Theory/Diophantine

Pell's Equation
Record solutions.
http://www.ieeta.pt/~tos/pell.html
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Diophantus Quadraticus
On-line Pell Equation solver by Michael Zuker.
http://www.bioinfo.rpi.edu/~zukerm/cgi-bin/dq.html
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Rational and Integral Points on Higher-dimensional Varieties
Some of conjectures and open problems, compiled at AIM.
http://aimath.org/WWN/qptsurface2/
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Diagonal Quartic Surfaces
Articles, computations and software in Magma and GP by Martin Bright.
http://www.boojum.org.uk/maths/quartic-surfaces/
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Linear Diophantine Equations
A web tool for solving Diophantine equations of the form ax + by = c.
http://www.thoralf.uwaterloo.ca/htdocs/linear.html
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Pythagorean Triples Etcetera
A web text by Fred Barnes on 60-, 90-, and 120-degree integer-sided triangles.
http://www.geocities.com/fredlb37/
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Developing A General 2nd Degree Diophantine Equation x^2 + p = 2^n
Methods to solve these equations.
http://oas.ucok.edu/OJAS/98/T98/THIENDO.HTM
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Pythagorean Triples in JAVA
A JavaScript applet which reads a and gives integer solutions of a^2+b^2 = c^2.
http://www.hbnweb.de/pythagoras/pythagoras.html
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Pythagorean Triplets
A Javascript calculator for pythagorean triplets.
http://www.hbmeyer.de/pythagen.htm
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