Numerus naturalis

E Vicipaedia

Sistemata Numerica Mathematicae.
Numeri Elementarii

Naturales \mathbb{N} {0,1,2,3...}

  • Primi \mathbb{P} {2,3,5,7,11...}
  • Abundantes
  • Amicabiles
  • Composti
  • Defectivi
  • Perfecti
  • Sociabiles

Integri \mathbb{Z} {...-2,-1,0,+1,+2,...}

  • Pares {...-2,0,+2,..}
  • Impares {...-3,-1,+1,+3...}

Rationales \mathbb{Q}{...-1/2..0..1/2..1...}
Reales \mathbb{R} {Q U I U Tr}

Complexi \mathbb{C}

  • Numerus imaginarius i = \sqrt{-1}

Infinitas \infty

Aliae bases

Numerus naturalis non solum integer positivus numerus ex 1,2,3,4\ldots sed etiam integer non-negativus numerus ex 0,1,2,3,4\ldots significari potest. Mathematici coniunctum naturalium numerorum a littera \mathbb{N} saepe denotant, i.e.,

\mathbb{N}= \{0,1,2,3,4,5,\ldots\}

atque

\mathbb{N}^{*}= \{1,2,3,4,5,\ldots\}