coq-highschoolgeometry software package provides coq library for high school geometry proofs/formalisation, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install coq-highschoolgeometry
coq-highschoolgeometry is installed in your system.
Make ensure the coq-highschoolgeometry package were installed using the commands given below,
$ sudo dpkg-query -l | grep coq-highschoolgeometry *
You will get with coq-highschoolgeometry package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | coq-highschoolgeometry |
| Version | 8.4+20150620-1 |
| Description | coq library for high school geometry proofs/formalisation |
| Sub Section | Math |