206 (عدد)

206 هو عدد صحيح.[1][2][3][4] طبيعي بين 205 و207

في الرياضيات

إيريك ويستاين، Natural Number، ماثوورلد Mathworld (باللغة الإنكليزية).
"natural number"، Merriam-Webster.com، ميريام وبستر، مؤرشف من الأصل في 2019-12-13، اطلع عليه بتاريخ 2014-10-04
Carothers (2000) says: "ℕ is the set of natural numbers (positive integers)" (p. 3)
Mac Lane & Birkhoff (1999) include zero in the natural numbers: "Intuitively, the set $ℕ = {0, 1, 2, ...}$ of all "natural numbers" may be described as follows: $ℕ$ contains an "initial" number 0; ...". They follow that with their version of the Peano Postulates. (p. 15)

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