File: EL_CONV.doc

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\DOC EL_CONV

\TYPE {EL_CONV : conv}

\SYNOPSIS
Computes by inference the result of indexing an element from a list.

\KEYWORDS
conversion, list.

\DESCRIBE
For any object language list of the form {"[x0;...xk;...;xn]"} ,
the result of evaluating
{
   EL_CONV "EL k [x0;...xk;...;xn]"
}
\noindent is the theorem
{
   |- EL k [x0;...;xk;...;xn] = xk
}


\FAILURE
{EL_CONV tm} fails if {tm} is not of the form described above, 
or {k} is not less than the length of the list.

\SEEALSO
ELL_CONV

\ENDDOC