module Commutative_group:sig..end
An implementation of this interface should have the following properties:
1: associativity: (a+b)+c = a+(b+c) for all elt's a,b,c
2: identity: zero+a = a+zero = a for all elt's a
3: inverses: given any elt a there exists a (unique) elt b such that a+b=b+a=zero
4: commutativity: a+b = b+a
An implementation of this interface should have the following properties:
1: associativity: (a+b)+c = a+(b+c) for all elt's a,b,c
2: identity: zero+a = a+zero = a for all elt's a
3: inverses: given any elt a there exists a (unique) elt b such that a+b=b+a=zero
4: commutativity: a+b = b+a
module type S =sig..end
An implementation of this interface should have the following properties:
1: associativity: (a+b)+c = a+(b+c) for all elt's a,b,c
2: identity: zero+a = a+zero = a for all elt's a
3: inverses: given any elt a there exists a (unique) elt b such that a+b=b+a=zero
4: commutativity: a+b = b+a