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

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).