is not closed underneath subtraction (that is certainly, subtracting 1 natural from A different isn't going to often cause Yet another natural), means that N displaystyle mathbb N can be a commutative monoid with id component 0. It's really a totally free monoid on one particular generator. This commutative https://sites.google.com/view/ayurvedic-supplements-online/best-ayurvedic-supplements-for-immunity