hol88-contrib-help software package provides Higher Order Logic, user contributed online help files, 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 hol88-contrib-help
hol88-contrib-help is installed in your system.
Make ensure the hol88-contrib-help package were installed using the commands given below,
$ sudo dpkg-query -l | grep hol88-contrib-help *
You will get with hol88-contrib-help package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | hol88-contrib-help |
| Version | 2.02.19940316-32 |
| Description | Higher Order Logic, user contributed online help files |
| Sub Section | Math |