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Source: wikipedia.org
عملية الجمع والطرح (Info)
العنصر النظير لعملية الجمع هو مضروب العدد في -1، بحيث يكون ناتج عملية جمع الطرفين هو العنصر المحايد لعملية الجمع وهو العدد صفر.
يقال عن عنصر ما أنه قابل للعكس إذا وفقط إذا كان له نظير ضمن مجموعة تعريف العملية.
