Looks like 'pair' was renamed in this commit on 09-February-2020.

https://github.com/fricas/fricas/commit/97141c6f61a07f1d9484745d7f4051a2caeb7148#diff-0c18939820a0db36a38e0c1b54eb94120dba864e05c18723c90cb3ae621ac7d8L461

However, I wonder how you can get this error if 'pair' is actually not
in FriCAS. Sounds like you are using old and new code together. (?)

Ralf

On 10/16/20 9:12 PM, Prof. Dr. Johannes Grabmeier privat wrote:
> 
> Hi all,
> 
> have a new error of an older code, which used to work an which I
> recompiled today:
> 
>  The function BOOT::PAIR is undefined.
> 
> 
> 346) -> )co dnf
>    Compiling FriCAS source code from file
> /Users/jgrabmeier/arbeiten/fricas/dnf/dnf.spad using
>       old system compiler.
>    TDNF abbreviates domain TermDisjunctiveNormalForm
> ------------------------------------------------------------------------
>    initializing NRLIB TDNF for TermDisjunctiveNormalForm
>    compiling into NRLIB TDNF
> 
>    >> System error:
>    The function BOOT::PAIR is undefined.
> 
> have stripped off the domain, the error occurs already with this skeleton:
> 
> TermDisjunctiveNormalForm(n: NonNegativeInteger):
>       public == private where
>   public ==> PRestrictedDirectProductCategory(2, n, PRestrictedInteger(2))
>   private ==> PRestrictedDirectProductInteger(2, n)
> 
> The p restricted types compile without problems.
> 

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