\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
Test:
NMSE problem 3.3.4
Bits:
128 bits
Bits error versus x
Time: 11.7 s
Input Error: 13.1
Output Error: 13.2
Log:
Profile: 🕒
\(\frac{e^{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right)}}{{x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\)
  1. Started with
    \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
    13.1
  2. Using strategy rm
    13.1
  3. Applied add-exp-log to get
    \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}} \leadsto \color{blue}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\right)}}\]
    13.1
  4. Using strategy rm
    13.1
  5. Applied add-sqr-sqrt to get
    \[e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{red}{{x}^{\left(\frac{1}{3}\right)}}\right)} \leadsto e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{blue}{{\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2}\right)}\]
    13.2
  6. Using strategy rm
    13.2
  7. Applied flip-- to get
    \[e^{\log \color{red}{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}} \leadsto e^{\log \color{blue}{\left(\frac{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2}\right)}}\]
    13.2
  8. Applied log-div to get
    \[e^{\color{red}{\log \left(\frac{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2}\right)}} \leadsto e^{\color{blue}{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right) - \log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}}\]
    13.3
  9. Applied exp-diff to get
    \[\color{red}{e^{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right) - \log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}} \leadsto \color{blue}{\frac{e^{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right)}}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}}}\]
    13.3
  10. Applied simplify to get
    \[\frac{e^{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right)}}{\color{red}{e^{\log \left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)} + {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}}} \leadsto \frac{e^{\log \left({\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 - {\left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\right)}^2\right)}}{\color{blue}{{x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}}\]
    13.2

  11. Removed slow pow expressions

Original test:


(lambda ((x default))
  #:name "NMSE problem 3.3.4"
  (- (pow (+ x 1) (/ 1 3)) (pow x (/ 1 3))))