These are typically not the first axioms posted by Peano, but are named in his honor. Some kinds of the Peano axioms have one instead of 0. In ordinary arithmetic, the successor of x displaystyle x 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。 Having said that, the two definitions are usually not equal, as there are https://www.reddit.com/user/Consistent-Load1428/