will not be shut underneath subtraction (that may be, subtracting a person natural from A further would not constantly lead to One more natural), implies that N displaystyle mathbb N is actually a commutative monoid with identity component 0. It is just a no cost monoid on one particular https://naturalhealthproducts.water.blog/2025/08/18/buy-herbal-medicines-online-with-cureayus-safe-remedies/