Added lemmas to Ring_and_Field with slightly modified simplification rules
Deleted some little-used integer theorems, replacing them by the generic ones
in Ring_and_Field
Consolidated integer powers
(*<*)
theory fakenat = Main:;
(*>*)
text{*\noindent
The type \tydx{nat} of natural
numbers is predefined to have the constructors \cdx{0} and~\cdx{Suc}. It behaves as if it were declared like this:
*}
datatype nat = 0 | Suc nat
(*<*)
end
(*>*)