\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
Test:
NMSE problem 3.3.4
Bits:
128 bits
Bits error versus x
Time: 34.4 s
Input Error: 21.8
Output Error: 29.0
Log:
Profile: 🕒
\(\begin{cases} \frac{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^3 - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^3}{{\left(e^{\frac{{\left(\sqrt[3]{\log \left(x + 1\right)}\right)}^3}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)} & \text{when } x \le 1.999642121285578 \cdot 10^{+17} \\ \left({x}^{\frac{-1}{3}} + \frac{1}{3} \cdot \sqrt[3]{\frac{1}{{x}^{4}}}\right) - \left(\frac{1}{9} \cdot \sqrt[3]{\frac{1}{{x}^{7}}} + \sqrt[3]{\frac{1}{x}}\right) & \text{otherwise} \end{cases}\)

    if x < 1.999642121285578e+17

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      1.7
    2. Using strategy rm
      1.7
    3. Applied add-exp-log to get
      \[{\color{red}{\left(x + 1\right)}}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)} \leadsto {\color{blue}{\left(e^{\log \left(x + 1\right)}\right)}}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      1.8
    4. Applied pow-exp to get
      \[\color{red}{{\left(e^{\log \left(x + 1\right)}\right)}^{\left(\frac{1}{3}\right)}} - {x}^{\left(\frac{1}{3}\right)} \leadsto \color{blue}{e^{\log \left(x + 1\right) \cdot \frac{1}{3}}} - {x}^{\left(\frac{1}{3}\right)}\]
      1.8
    5. Applied simplify to get
      \[e^{\color{red}{\log \left(x + 1\right) \cdot \frac{1}{3}}} - {x}^{\left(\frac{1}{3}\right)} \leadsto e^{\color{blue}{\frac{\log \left(x + 1\right)}{3}}} - {x}^{\left(\frac{1}{3}\right)}\]
      1.8
    6. Using strategy rm
      1.8
    7. Applied flip3-- to get
      \[\color{red}{e^{\frac{\log \left(x + 1\right)}{3}} - {x}^{\left(\frac{1}{3}\right)}} \leadsto \color{blue}{\frac{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^{3} - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^{3}}{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}}\]
      1.9
    8. Applied simplify to get
      \[\frac{\color{red}{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^{3} - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^{3}}}{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)} \leadsto \frac{\color{blue}{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^3 - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^3}}{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}\]
      1.9
    9. Using strategy rm
      1.9
    10. Applied add-cube-cbrt to get
      \[\frac{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^3 - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^3}{{\left(e^{\frac{\color{red}{\log \left(x + 1\right)}}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)} \leadsto \frac{{\left(e^{\frac{\log \left(x + 1\right)}{3}}\right)}^3 - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^3}{{\left(e^{\frac{\color{blue}{{\left(\sqrt[3]{\log \left(x + 1\right)}\right)}^3}}{3}}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + e^{\frac{\log \left(x + 1\right)}{3}} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}\]
      1.9

    if 1.999642121285578e+17 < x

    1. Started with
      \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      45.2
    2. Using strategy rm
      45.2
    3. Applied add-exp-log to get
      \[{\color{red}{\left(x + 1\right)}}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)} \leadsto {\color{blue}{\left(e^{\log \left(x + 1\right)}\right)}}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
      61.9
    4. Applied pow-exp to get
      \[\color{red}{{\left(e^{\log \left(x + 1\right)}\right)}^{\left(\frac{1}{3}\right)}} - {x}^{\left(\frac{1}{3}\right)} \leadsto \color{blue}{e^{\log \left(x + 1\right) \cdot \frac{1}{3}}} - {x}^{\left(\frac{1}{3}\right)}\]
      61.9
    5. Applied simplify to get
      \[e^{\color{red}{\log \left(x + 1\right) \cdot \frac{1}{3}}} - {x}^{\left(\frac{1}{3}\right)} \leadsto e^{\color{blue}{\frac{\log \left(x + 1\right)}{3}}} - {x}^{\left(\frac{1}{3}\right)}\]
      61.6
    6. Applied taylor to get
      \[e^{\frac{\log \left(x + 1\right)}{3}} - {x}^{\left(\frac{1}{3}\right)} \leadsto e^{\frac{\log \left(x + 1\right)}{3}} - {x}^{\frac{1}{3}}\]
      61.6
    7. Taylor expanded around 0 to get
      \[e^{\frac{\log \left(x + 1\right)}{3}} - \color{red}{{x}^{\frac{1}{3}}} \leadsto e^{\frac{\log \left(x + 1\right)}{3}} - \color{blue}{{x}^{\frac{1}{3}}}\]
      61.6
    8. Applied simplify to get
      \[\color{red}{e^{\frac{\log \left(x + 1\right)}{3}} - {x}^{\frac{1}{3}}} \leadsto \color{blue}{e^{\frac{\log \left(x + 1\right)}{3}} - \sqrt[3]{x}}\]
      61.9
    9. Applied taylor to get
      \[e^{\frac{\log \left(x + 1\right)}{3}} - \sqrt[3]{x} \leadsto \left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {x}^{\frac{-1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + \sqrt[3]{\frac{1}{x}}\right)\]
      60.5
    10. Taylor expanded around inf to get
      \[\color{red}{\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {x}^{\frac{-1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + \sqrt[3]{\frac{1}{x}}\right)} \leadsto \color{blue}{\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {x}^{\frac{-1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + \sqrt[3]{\frac{1}{x}}\right)}\]
      60.5
    11. Applied simplify to get
      \[\left(\frac{1}{3} \cdot {\left(\frac{1}{{x}^{4}}\right)}^{\frac{1}{3}} + {x}^{\frac{-1}{3}}\right) - \left(\frac{1}{9} \cdot {\left(\frac{1}{{x}^{7}}\right)}^{\frac{1}{3}} + \sqrt[3]{\frac{1}{x}}\right) \leadsto \left({x}^{\frac{-1}{3}} + \frac{1}{3} \cdot \sqrt[3]{\frac{1}{{x}^{4}}}\right) - \left(\frac{1}{9} \cdot \sqrt[3]{\frac{1}{{x}^{7}}} + \sqrt[3]{\frac{1}{x}}\right)\]
      60.5

    12. Applied final simplification

  1. Removed slow pow expressions

Original test:


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