On 24/06/15 15:55, Larry Paulson wrote: > A more appropriate point is that it can be tricky in Isabelle/jEdit to determine the type of an expression such as “of_nat k”, as there is nothing to click on. When I type ‘term "sqrt (of_nat 2)"’ and hover over the ‘of_nat’, it says ‘constant "Nat.semiring_1_class.of_nat" :: nat ⇒ real’.