is not really shut underneath subtraction (that may be, subtracting a person natural from A different will not always bring about One more natural), implies that N displaystyle mathbb N is actually a commutative monoid with identification component 0. It is just a absolutely free monoid on 1 generator. https://buyhair2glowhaircare.blogspot.com/2025/08/cureayu-best-ayurvedic-brand-in-india.html