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Теория на числата


цяло число












Четност




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Емблема за пояснителна страницаТази статия е за свойството на числата. За понятието от квантовата механика вижте Четност (физика).

Всяко цяло число е или четно, или нечетно. Четността на числата се определя по следния начин: ако едно цяло число е точно кратно на 2 (при деление на 2 се получава друго цяло число), числото е четно; останалите цели числа са нечетни.[1]


Редицата на четните числа може да бъде записана така:



Четни числа = 2Z = ..., −6, −4, −2, 0, 2, 4, 6, ....

Редицата на нечетните числа може да бъде показана по този начин:



Нечетни числа = 2Z + 1 или 2Z – 1 = ..., −5, −3, −1, 1, 3, 5, ....

На 2 се делят само тези числа, на които последната цифра означава четно число.



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Взето от „https://bg.wikipedia.org/w/index.php?title=Четност&oldid=9364164“.










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