# Some issues using the GTpack package

**URL:** <https://community.wolfram.com/t/some-issues-using-the-gtpack-package/19616>\
**Category:** Questions\
**Tags:** mathematica, packages-and-paclets\
**Created:** [February 15, 2022, 12:15pm UTC](https://community.wolfram.com/t/some-issues-using-the-gtpack-package/19616 "2022-02-15T12:15:17Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![hongyizhao](https://avatars.discourse-cdn.com/v4/letter/h/8491ac/32.png) [@hongyizhao](https://community.wolfram.com/u/hongyizhao)\
**Post date:** [February 15, 2022, 12:15pm UTC](https://community.wolfram.com/t/some-issues-using-the-gtpack-package/19616/1 "2022-02-15T12:15:17Z")

</div>

Hi all,

I’m currently learning and using the [gtpack package](https://gtpack.org/), which is a Mathematica based Group Theory Package. However, I also encountered some problems in use, as follows:

(A). gtpack can’t be reloaded repeatedly, even I’ve wiped the variables/functions and removed all the symbols from the kernel with the following commands, as commented [here](https://mathematica.stackexchange.com/a/884):

```
    ClearAll[Evaluate[$Context<>"*"]];
    Remove[Evaluate[$Context<>"*"]];

```

Basically, I mean, if I try to run the following command sequences:

```
<< GroupTheory`;
ClearAll[Evaluate[$Context <> "*"]];
Remove[Evaluate[$Context <> "*"]];
<< GroupTheory`

```

The following error will be triggered:

```
Error: The axis label x already exists!
$Aborted

```

(B). As we all know, when a user enters a partial string at the beginning of a command, Mathematica can prompt the user for all possible candidate commands. But I can’t see this feature for all  
commands/functions defined in gtpack package. Considering that there are many custom commands and function names in the package, this is very inconvenient for users. Therefore, I wonder if there is any way to achieve this.

(C). I’ve noticed that the complex represention of “SU(2)” matrix corresponding to the same O(3) element, for example, R(2Pi/3, (0,0,1)), has the following two different forms, as shown below:

 ![image.png](https://global.discourse-cdn.com/wolfram/original/3X/f/1/f187cb0e53eb48d1809b812dbe0da74bea79ff36.png)

Any hints for these differences and questions will be highly appreciated.

Regards

---

<div class="post-metadata">

**Author:** ![danl](https://yyz1.discourse-cdn.com/wolfram/user_avatar/community.wolfram.com/danl/32/41267_2.png) [@danl](https://community.wolfram.com/u/danl)\
**Post date:** [February 16, 2022, 2:15pm UTC](https://community.wolfram.com/t/some-issues-using-the-gtpack-package/19616/2 "2022-02-16T14:15:06Z")

</div>

Have you contacted the authors of the package? They will have the most familiarity with it.

---

<div class="post-metadata">

**Author:** ![hongyizhao](https://avatars.discourse-cdn.com/v4/letter/h/8491ac/32.png) [@hongyizhao](https://community.wolfram.com/u/hongyizhao)\
**Post date:** [February 16, 2022, 2:46pm UTC](https://community.wolfram.com/t/some-issues-using-the-gtpack-package/19616/3 "2022-02-16T14:46:22Z")

</div>

I’ve already contacted the developer, but did not get any reply.