New posts in Natural Numbers

Is aleph-$0$ a natural number?

Why don't we use Presburger's arithmetic instead of Peano's arithmetic?

Natural numbers in set theory is $\{0,1,2,...\}?$

$\mathbb{Z}^{+}$ includes zero or not?

How can I define $\mathbb{N}$ if I postulate existence of a Dedekind-infinite set rather than existence of an inductive set?

Sum of sum of $k$th power of first $n$ natural numbers.

Landau's "Foundations of Analysis" - Addition of natural numbers

About the Collatz conjecture

Given real numbers: define integers?

Prove 24 divides $u^3-u$ for all odd natural numbers $u$