/usr/share/hol88-2.02.19940316/help/ENTRIES/tyvarsl.doc is in hol88-help 2.02.19940316-35.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | \DOC tyvarsl
\TYPE {tyvarsl : (term list -> type list)}
\SYNOPSIS
Returns a list of the type variables free in a list of terms.
\DESCRIBE
When applied to a list of terms, {tyvarsl} returns a list (possibly empty) of
the type variables which are free in any of those terms.
\FAILURE
Never fails.
\EXAMPLE
{
#tyvarsl ["!x. x = 1"; "!x:*. x = x"];;
[":*"] : type list
}
\USES
Finding all the free type variables in the assumptions of a theorem, as a check
on the validity of certain inferences.
\COMMENTS
In the current HOL logic, there is no binding operation for types, so `is free
in' is synonymous with `appears in'.
\SEEALSO
tyvars.
\ENDDOC
|