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.TH GIAC 1 "2014-4-6"
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.SH NAME
giac \- computer algebra system
.SH SYNOPSIS
.B giac
.RI [ options ] " files"
.br
.B icas
.RI [ options ] " files" 
.br
.B xcas
.RI " files"
.br 
.B cas_help
.RI " keyword" 
.SH DESCRIPTION
.PP
.\" TeX users may be more comfortable with the \fB<whatever>\fP and
.\" \fI<whatever>\fP escape sequences to invode bold face and italics, 
.\" respectively.
\fBgiac\fP is an advanced symbolic and numeric calculator by
Bernard Parisse. The console interface is named 
.B icas 
or equivalently
.B giac
. 
The corresponding GUI program is called 
.B xcas.
These programs has extensive html documentation; One can also obtain some
help about a keyword like this:
.br
.P 
.IR
.br 
   0>> ?gcd
.br
   Returns the greatest common divisor of 2 polynomials of several variables 
   or of 2 integers or of 2 rationals.
.br
   (Intg(a) or Poly),(Intg(b) or Poly)
.br
   gcd(45,75);gcd(15/7,50/9);gcd(x^2-2*x+1,x^3-1);gcd(t^2-2*t+1,t^2+t-2);
.br
   gcd((x^2-1)*(y^2-1)*z^2,x^3*y^3*z+(-(y^3))*z+x^3*z-z)
.br
   lcm,euler,modgcd,ezgcd,psrgcd,heugcd,Gcd


.br
.SH OPTIONS
.TP
.B \-\-version
Show version of program.
.TP
.B \-\-texmacs
To call giac/icas from Texmacs
.TP
.B \-\-emacs
To call giac/icas from Emacs
.TP
.B \-\-sage 
To call giac from Sage

.SH SEE ALSO
The programs are documented fully by
.IR "GIAC/XCAS manual" 
in html format in /usr/share/giac/doc.

.br
.br
.B
C++ 
programers will find some informations about the giac library in the 
.I
info
manual.

.SH AUTHOR
Bernard Parisse. http://www-fourier.ujf-grenoble.fr/~parisse/giac.html
.SH LICENSE
GPLv3+