4 ms·
That's the very interesting border between numbers as abstractions of quantities and numbers as element of a set (N, Z, R, C etc. The question of 0 is particula
by UhUhUhUh 12y ago
That's the very interesting border between numbers as abstractions of quantities and numbers as element of a set (N, Z, R, C etc. The question of 0 is particularly puzzling to me.
- wyager 12y agoMost 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 12y agoN is not a group under addition (lacks inverses).