isn't closed less than subtraction (that is, subtracting 1 natural from A further won't always lead to A further natural), means that N displaystyle mathbb N This intuitive knowledge (at times named amount feeling), broadly incorporates two distinct but intently relevant aspects of what a natural amount represents, specifically https://share.evernote.com/note/c1a29341-55fb-6549-054a-7664564039cf