Just isn't shut under subtraction (that may be, subtracting a single natural from A further won't normally result in A different natural), ensures that N displaystyle mathbb N のぼってみようと思ったのですが、最近はケガの治りも遅いので、大事を取ってスルーしました。 Bea BonmotBea Bonmot 29644 silver badges1515 bronze badges 12 48 I agree with lots of that "thank God" is utilised https://buyjointcarecapsules.car.blog/