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=head1 NAME
gcd - compute greatest common divisor of two integers
=head1 SYNOPSIS
gcd <a> <b>
=head1 DESCRIPTION
The B<gcd> program computes the greatest common divisor of two
arbitrary-precision integers I<a> and I<b>. The result is written in
standard decimal notation to the standard output.
If I<b> is zero, B<gcd> will print an error message and exit.
=head1 SEE ALSO
invmod(1), isprime(1), lap(1)
=head1 AUTHOR
Michael J. Fromberger <sting@linguist.dartmouth.edu>
Thayer School of Engineering, Hanover, New Hampshire, USA
$Date$
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