---
name: "cas_help"
section: "1"
platform: "linux"
package: "xcas"
version: "1.9.0.93+dfsg2-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/cas_help"
---

# cas\_help(1)

help for the giac/xcas computer algebra system

## NAME

cas\_help - help for the giac/xcas computer algebra system

## SYNOPSIS

**cas\_help**  keyword\
 **en\_cas\_help**  keyword\
 **es\_cas\_help**  keyword\
 **fr\_cas\_help**  keyword

## DESCRIPTION

This is the help engine of the symbolic and numeric calculator **giac**  by Bernard Parisse. It is available in some different languages.

## EXAMPLE

**cas\_help** gcd

- Help for gcd:

  gcd((Intg(a) or Poly),(Intg(b) or Poly))\
   Returns the greatest common divisor of 2 polynomials of several variables or of 2 integers or of 2 rationals.\
   See also: 1/ lcm 2/ euler 2/ modgcd 3/ ezgcd 4/ psrgcd 5/ heugcd 6/ Gcd\
   Ex1:gcd(45,75)\
   Ex2:gcd(15/7,50/9)\
   Ex3:gcd(x^2-2\*x+1,x^3-1)\
   Ex4:gcd(t^2-2\*t+1,t^2+t-2)\
   Ex5:gcd((x^2-1)\*(y^2-1)\*z^2,x^3\*y^3\*z+(-(y^3))\*z+x^3\*z-z)\

## SEE ALSO

[**icas**(1)](/icas/1.md), [**xcas**(1)](/xcas/1.md)

## AUTHORS

**giac** is written by Bernard Parisse. https://www-fourier.ujf-grenoble.fr/~parisse/giac.html

This manual page was written by Carleos Artime \<carleos@pinon.ccu.uniovi.es\> and Ximin Luo \<infinity0@debian.org\> for the Debian GNU/Linux system (but may be used by others).

## LICENSE

GPLv3+