8. Find a fixed point `ξ` for the successor function. Prove it's a fixed
point, i.e., demonstrate that `succ ξ <~~> ξ`.
- We've had surprising success embedding normal arithmetic in the lambda
-calculus, modeling the natural numbers, addition, multiplication, and
+ We've had surprising success embedding normal arithmetic in the Lambda
+Calculus, modeling the natural numbers, addition, multiplication, and
so on. But one thing that some versions of arithmetic supply is a
notion of infinity, which we'll write as `inf`. This object usually
satisfies the following constraints, for any finite natural number `n`: