Most numerical sets you're likely to run into (including N, Z, R, and C) are gro... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		wyager on April 21, 2015 \| parent \| context \| favorite \| on: If 1+x is 1, how much is 1-x? Most numerical sets you're likely to run into (including N, Z, R, and C) are groups under addition, which (among other things) means `x + a = a ⇔ x = 0`

sadfsdfsda on April 21, 2015 [–]

N is not a group under addition (lacks inverses).

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact