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diophantine equa
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2022-08-26
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DIOPHANTINE EQUATIONS
Equations whose solutions are
restricted to integers are known as
diophantine equations. Diophantus
(circa 275 BC) solved quadratic
equations in one variable and
discarded all but the positive
rational solutions.
A linear equation in two variables
AX + BY = C
is easy to solve over the real
numbers. In fact, except for some
degenerate cases, there are infinitely
many real pairs X, Y in the solution
set. Its graph forms a straight line.
A linear diophantine equation in two
variables is an equation of the form
AX + BY = C
where A,B, and C are integers AND the
solutions X, Y must also be integers.
The existence of integer solutions
to the equation is not guaranteed.
In fact, it is possible for such
equations to have no integer
solutions.
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