doc-src/TutorialI/CTL/ROOT.ML

Avoid a possible variable name conflict in instantiating a theorem.

Instantiating a theorem variable with new variables created a possible
variable name conflict if a record was defined with a field named
'f', 'x' etc. Using variable indices of 1 avoids the problem.

use "../settings.ML";
use_thy "PDL";
use_thy "CTL";
use_thy "CTLind";