\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
Test:
NMSE problem 3.3.4
Bits:
128 bits
Bits error versus x
Time: 14.1 s
Input Error: 13.2
Output Error: 13.4
Log:
Profile: 🕒
\(\frac{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \left({\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^{3} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^{3}\right)}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 + \left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2 + \sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} \cdot \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}\)
  1. Started with
    \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
    13.2
  2. Using strategy rm
    13.2
  3. Applied add-sqr-sqrt to get
    \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{red}{{x}^{\left(\frac{1}{3}\right)}} \leadsto {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - \color{blue}{{\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2}\]
    13.4
  4. Applied add-sqr-sqrt to get
    \[\color{red}{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2 \leadsto \color{blue}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2\]
    13.3
  5. Applied difference-of-squares to get
    \[\color{red}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2} \leadsto \color{blue}{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} - \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}\]
    13.3
  6. Using strategy rm
    13.3
  7. Applied flip3-- to get
    \[\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \color{red}{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} - \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)} \leadsto \left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \color{blue}{\frac{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^{3} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^{3}}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 + \left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2 + \sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} \cdot \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}}\]
    13.4
  8. Applied associate-*r/ to get
    \[\color{red}{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \frac{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^{3} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^{3}}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 + \left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2 + \sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} \cdot \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}} \leadsto \color{blue}{\frac{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} + \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right) \cdot \left({\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^{3} - {\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^{3}\right)}{{\left(\sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\right)}^2 + \left({\left(\sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}^2 + \sqrt{{\left(x + 1\right)}^{\left(\frac{1}{3}\right)}} \cdot \sqrt{{x}^{\left(\frac{1}{3}\right)}}\right)}}\]
    13.4

Original test:


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