Sure, that's fine. I probably wouldn't even define such a constant but
would instead use ``FILTER ((<>) x) ls`` in place.
Stylistically it's usually better to use Define instead of new_definition,
and to name defining theorems with a "_def" suffix. I'd also keep the name
short like "DELETE" or even "delete".
On 2 Jul 2017 17:04, "Chun Tian (binghe)" <binghe.l...@gmail.com> wrote:
> Hi,
>
> It seems that ListTheory didn’t provide a way to remove elements from
> list? What’s the recommended way to do such operation? Should I use FILTER,
> for example, like this?
>
> val DELETE_FROM_LIST = new_definition (
> "DELETE_FROM_LIST", ``DELETE_FROM_LIST x list = (FILTER (\i. ~(i = x))
> list)``);
>
> Regards,
>
> Chun
>
>
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