Average Error: 29.9 → 2.6
Time: 1.4m
Precision: 64
Ground Truth: 128
\[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
\[\frac{1}{e^{\frac{\log x}{3}} \cdot \left({x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right) + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\]

Error

Bits error versus x

Derivation

  1. Initial program 29.9

    \[{\left(x + 1\right)}^{\left(\frac{1}{3}\right)} - {x}^{\left(\frac{1}{3}\right)}\]
  2. Using strategy rm
  3. Applied flip3-- 29.8

    \[\leadsto \color{blue}{\frac{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^{3} - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^{3}}{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}}\]
  4. Applied simplify 29.8

    \[\leadsto \frac{\color{blue}{{\left({\left(1 + x\right)}^{\left(\frac{1}{3}\right)}\right)}^3 - {\left({x}^{\left(\frac{1}{3}\right)}\right)}^3}}{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}\]
  5. Applied taylor 32.8

    \[\leadsto \frac{{\left({\left(1 + \frac{1}{x}\right)}^{\frac{1}{3}}\right)}^3 - {\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right)}^3}{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}\]
  6. Taylor expanded around inf 32.8

    \[\leadsto \frac{\color{blue}{{\left({\left(1 + \frac{1}{x}\right)}^{\frac{1}{3}}\right)}^3 - {\left({\left(\frac{1}{x}\right)}^{\frac{1}{3}}\right)}^3}}{{\left({\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right)}^2 + \left({\left({x}^{\left(\frac{1}{3}\right)}\right)}^2 + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {x}^{\left(\frac{1}{3}\right)}\right)}\]
  7. Applied simplify 3.1

    \[\leadsto \color{blue}{\frac{1}{{x}^{\left(\frac{1}{3}\right)} \cdot \left({x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right) + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}}\]
  8. Using strategy rm
  9. Applied pow-to-exp 3.0

    \[\leadsto \frac{1}{\color{blue}{e^{\log x \cdot \frac{1}{3}}} \cdot \left({x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right) + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\]
  10. Applied simplify 2.6

    \[\leadsto \frac{1}{e^{\color{blue}{\frac{\log x}{3}}} \cdot \left({x}^{\left(\frac{1}{3}\right)} + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}\right) + {\left(x + 1\right)}^{\left(\frac{1}{3}\right)} \cdot {\left(x + 1\right)}^{\left(\frac{1}{3}\right)}}\]
  11. Removed slow pow expressions

Runtime

Total time: 1.4m Debug log

Please include this information when filing a bug report:

herbie --seed '#(1802308604 3230805970 3130434111 4188825103 2860323385 2783485683)'
(FPCore (x)
  :name "NMSE problem 3.3.4"
  (- (pow (+ x 1) (/ 1 3)) (pow x (/ 1 3))))