Exercise · ZW-CONSTRUCTION-OF-THE-NATURALS-003 · ★☆☆ Basic
How many elements does the natural \(4\) have?
Choose one option.
Show answer
- D. \(4\)
Explanation
Each natural \(n\) has exactly \(n\) elements, so \(4\) has four.
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-001 What is the set 1 in the von Neumann construction?
- ZW-CONSTRUCTION-OF-THE-NATURALS-002 What set is 0 in this construction?
- ZW-CONSTRUCTION-OF-THE-NATURALS-004 What is the successor of 2?
- ZW-CONSTRUCTION-OF-THE-NATURALS-005 Compute 2^+ using the definition of successor.
- ZW-CONSTRUCTION-OF-THE-NATURALS-006 How many elements does 3^+ have?
- ZW-CONSTRUCTION-OF-THE-NATURALS-007 If n=\0,1\, what is n^+?
- ZW-CONSTRUCTION-OF-THE-NATURALS-008 What is the set ℕ∩\0,1,2\ of naturals less than 3?
- ZW-CONSTRUCTION-OF-THE-NATURALS-009 Let A=\x∈ℕ: xne 0\. Which statement correctly shows that A is not inductive?
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