What is the fundamental difference between a method defined by l = ς(x)b in an object o and a function with argument x defined by the λ-term λ(x)b? Describe at least two different ways to encode...

What is the fundamental difference between a method defined by l = ς(x)b

in an object o and a function with argument x defined by the λ-term λ(x)b?

Describe at least two different ways to encode numbers in the object calculus.