is not really shut less than subtraction (that's, subtracting a person natural from another isn't going to usually bring about An additional natural), ensures that N displaystyle mathbb N In 19th century Europe, there was mathematical and philosophical dialogue about the precise nature in the natural quantities. Henri Poincaré https://safeherbalsupplements.music.blog/2025/09/03/ayurvedic-medicine-for-lifestyle-disorders-cureayu-solutions/