jesus fuck /x/ is retarded
>>40861560 (OP)
0 is important, it has many desirable properties in math and is very useful (keywords: group, ring, field).
>>40861828
>have no apples
>buy one (1) apple
>wtf i have no apples because 0+1=0????/??
>>40861864
?????????????????????????????
>>40861901
-0 = 0. There. I expanded your knowledge.
>>40861919
It allows you to:
- define negative numbers
- many types of equations are often rephrased to [left side] - [right side] = 0 to make them easier to solve (e.g. quadratics of the type 3x^2+2x = 7x - 5 would become 3x^2 - 5x + 5 = 0, whence you can use the quadratic formula)
- 0 is known as the additive identity in algebra, so it's required in most (interesting) algebraic structures (additive groups/monoids, rings, fields, ...) to give them certain important properties. The real numbers being a field, for instance, guarantees that every number except 0 can be divided by and that you can cancel addition and multiplication (e.g. a * b = a * c implies b = c)
- it is the cardinality of the empty set
- your le heckin' epic 0 equation: e^{i * pi} + 1 = 0
>>40861934
define your "the maths of actualy nature" and what "perfect" numbers are supposed to be
>>40862025
Many jobs require basic arithmetic, which is what you seem to be complaining about, though they usually require an IQ above 80 to perform, which is why you've never needed it.
>>40864488
Look up bijective numerical bases, they're kinda cool.
Ultimately, as
>>40864804 points out, mathematics is semi-arbitrary, as in, we (somewhat arbitrarily) define some basic rules and look what they logically lead to. And for the sorts of things we need numbers for, we have found "0" to be fairly useful, which is why we've defined it into existence, as in, there would likely be a lot of things we couldn't do in math without it.