Exercise · ZW-CONSTRUCTION-OF-THE-NATURALS-009 · ★★★ Advanced

Let \(A=\{x\in\mathbb{N}: x\ne 0\}\). Which statement correctly shows that \(A\) is not inductive?

Choose one option.

Show answer
  • B. \(0\in A\) fails, so \(A\) does not contain zero and is not inductive

Explanation

An inductive set must contain zero, and \(A\) excludes it, so it is not inductive.

Study Set theory in ZWMath →

Review the concept: Construction of the naturals

The natural numbers are a set \(\mathbb{N}\) built inside set theory as finite ordinals, where each natural is the set of all naturals smaller than it.

\[n^+ = n \cup \{n\}\]

More practice problems: construction of the naturals

← ZW-CONSTRUCTION-OF-THE-NATURALS-008 ZW-CONSTRUCTION-OF-THE-NATURALS-010 →