\[\frac{-\left(f + n\right)}{f - n}\]
Test:
subtraction fraction
Bits:
128 bits
Bits error versus f
Bits error versus n
Time: 7.1 s
Input Error: 0.0
Output Error: 0.0
Log: ⚲
Profile: 🕒
\(\frac{-\left(f + n\right)}{f - n}\)
  1. Started with
    \[\frac{-\left(f + n\right)}{f - n}\]
    0.0
  2. Removed slow pow expressions

Original test:


(lambda ((f default) (n default))
  #:name "subtraction fraction"
  (/ (- (+ f n)) (- f n)))