/*
* sqrt(m) * 2^(p) , if e = 2*p
- * sqrt(m*2^e) =
+ * sqrt(m*2^e) =
* sqrt(2*m) * 2^(p) , if e = 2*p + 1
*
* So we use the last bit of the exponent to decide wether to
* which has a null point on x = sqrt(r).
*
* It gives:
- * x' := x - f(x)/f'(x)
+ * x' := x - f(x)/f'(x)
* = x - (x^2 -r)/(2*x)
* = x - (x - r/x)/2
* = (2*x - x + r/x)/2