Feature #387
Updated by liaham over 4 years ago
Especially the sum function is currently not able to consider algebraic signs in order to execute a subtraction.
There needs to be a class which is able to store the position of the algebraic sign in the formula considered as Array.
```ruby
class AlgebraicSign
def initialize(sign:, index: )
@sign = sign
@index = index
end
end
```