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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | \DOC tyvars
\TYPE {tyvars : (term -> type list)}
\SYNOPSIS
Returns a list of the type variables free in a term.
\DESCRIBE
When applied to a term, {tyvars} returns a list (possibly empty) of the type
variables which are free in the term.
\FAILURE
Never fails.
\EXAMPLE
{
#PAIR;;
|- !x. FST x,SND x = x
#tyvars (concl PAIR);;
[":*"; ":**"] : type list
#tyvars "x + 1 = SUC x";;
[] : type list
}
\COMMENTS
In the current HOL logic, there is no binding operation for types, so `is free
in' is synonymous with `appears in'.
\SEEALSO
tyvarsl.
\ENDDOC
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