Unum rebuttal

[Timon Gehr via Digitalmars-d]

On 15.09.2017 06:14, Joseph wrote:
> ... How can be be taken seriously if
> his rebuttle has basic mistakes and typos?
> 

:-)

> https://people.eecs.berkeley.edu/~wkahan/EndErErs.pdf
> page 5:
> 
> (y - sqrt(y^2 + 1)) - 1/(y + sqrt(y^2 + 1))
> 
> is not zero for all y.
> 
> I assume he means
> at
> (y - sqrt(y^2 + 1)) + 1/(y + sqrt(y^2 + 1))
> 
> 

No, he means what he wrote, which is
|y-√(y²+1)| - 1/(y+√(y²+1)).

In D notation:
abs(y-sqrt(y^^2+1)) - 1/(y+sqrt(y^^2+1)).