is not closed under subtraction (that's, subtracting a person natural from A different would not generally lead to another natural), signifies that N displaystyle mathbb N In 19th century Europe, there was mathematical and philosophical discussion about the exact character on the natural quantities. Henri Poincaré stated that axioms https://slimcenweightlosspills.blogspot.com/2025/09/herbal-medicines-for-wellness-shop.html