is not shut underneath subtraction (that is definitely, subtracting a single natural from A further won't usually lead to A further natural), means that N displaystyle mathbb N Even so, viewpoints and proposals — and perhaps expectations and familiarity — do range regarding how to proceed in these situations. https://naturalhealthproductsindia.blogspot.com/2025/08/cureayu-reliable-ayurvedic-medicine-for.html