Average Error: 33.7 → 26.1
Time: 1.3m
Precision: 64
Internal Precision: 128
\[\sqrt{\left(\left(2 \cdot n\right) \cdot U\right) \cdot \left(\left(t - 2 \cdot \frac{\ell \cdot \ell}{Om}\right) - \left(n \cdot {\left(\frac{\ell}{Om}\right)}^{2}\right) \cdot \left(U - U*\right)\right)}\]
↓
\[\sqrt{\left(\left(n \cdot 2\right) \cdot U\right) \cdot t + 2 \cdot \left(\left(-2 \cdot \ell - \left(U - U*\right) \cdot \left(\frac{\ell}{Om} \cdot n\right)\right) \cdot \left(\left(\sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)} \cdot \sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)}\right) \cdot \sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)}\right)\right)}\]

Error

Bits error versus n

Bits error versus U

Bits error versus t

Bits error versus l

Bits error versus Om

Bits error versus U*

Derivation

  1. Initial program 33.7

    \[\sqrt{\left(\left(2 \cdot n\right) \cdot U\right) \cdot \left(\left(t - 2 \cdot \frac{\ell \cdot \ell}{Om}\right) - \left(n \cdot {\left(\frac{\ell}{Om}\right)}^{2}\right) \cdot \left(U - U*\right)\right)}\]
  2. Using strategy rm

  3. Applied *-un-lft-identity33.7

    \[\leadsto \sqrt{\left(\left(2 \cdot n\right) \cdot U\right) \cdot \color{blue}{\left(1 \cdot \left(\left(t - 2 \cdot \frac{\ell \cdot \ell}{Om}\right) - \left(n \cdot {\left(\frac{\ell}{Om}\right)}^{2}\right) \cdot \left(U - U*\right)\right)\right)}}\]

  4. Applied associate-*r*33.7

    \[\leadsto \sqrt{\color{blue}{\left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) \cdot \left(\left(t - 2 \cdot \frac{\ell \cdot \ell}{Om}\right) - \left(n \cdot {\left(\frac{\ell}{Om}\right)}^{2}\right) \cdot \left(U - U*\right)\right)}}\]

  5. Simplified30.1

    \[\leadsto \sqrt{\left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) \cdot \color{blue}{\left(t - \frac{\ell}{Om} \cdot \left(\ell \cdot 2 - \left(-\left(U - U*\right) \cdot \left(\frac{\ell}{Om} \cdot n\right)\right)\right)\right)}}\]
  6. Using strategy rm

  7. Applied sub-neg30.1

    \[\leadsto \sqrt{\left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) \cdot \color{blue}{\left(t + \left(-\frac{\ell}{Om} \cdot \left(\ell \cdot 2 - \left(-\left(U - U*\right) \cdot \left(\frac{\ell}{Om} \cdot n\right)\right)\right)\right)\right)}}\]

  8. Applied distribute-rgt-in30.1

    \[\leadsto \sqrt{\color{blue}{t \cdot \left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) + \left(-\frac{\ell}{Om} \cdot \left(\ell \cdot 2 - \left(-\left(U - U*\right) \cdot \left(\frac{\ell}{Om} \cdot n\right)\right)\right)\right) \cdot \left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right)}}\]

  9. Simplified26.0

    \[\leadsto \sqrt{t \cdot \left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) + \color{blue}{\left(\left(\left(\frac{\ell}{Om} \cdot n\right) \cdot U\right) \cdot \left(\ell \cdot -2 - \left(\frac{\ell}{Om} \cdot n\right) \cdot \left(U - U*\right)\right)\right) \cdot 2}}\]
  10. Using strategy rm

  11. Applied add-cube-cbrt26.1

    \[\leadsto \sqrt{t \cdot \left(\left(\left(2 \cdot n\right) \cdot U\right) \cdot 1\right) + \left(\color{blue}{\left(\left(\sqrt[3]{\left(\frac{\ell}{Om} \cdot n\right) \cdot U} \cdot \sqrt[3]{\left(\frac{\ell}{Om} \cdot n\right) \cdot U}\right) \cdot \sqrt[3]{\left(\frac{\ell}{Om} \cdot n\right) \cdot U}\right)} \cdot \left(\ell \cdot -2 - \left(\frac{\ell}{Om} \cdot n\right) \cdot \left(U - U*\right)\right)\right) \cdot 2}\]

  12. Final simplification26.1

    \[\leadsto \sqrt{\left(\left(n \cdot 2\right) \cdot U\right) \cdot t + 2 \cdot \left(\left(-2 \cdot \ell - \left(U - U*\right) \cdot \left(\frac{\ell}{Om} \cdot n\right)\right) \cdot \left(\left(\sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)} \cdot \sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)}\right) \cdot \sqrt[3]{U \cdot \left(\frac{\ell}{Om} \cdot n\right)}\right)\right)}\]

Reproduce

herbie shell --seed 2019089 
(FPCore (n U t l Om U*)
  :name "Toniolo and Linder, Equation (13)"
  (sqrt (* (* (* 2 n) U) (- (- t (* 2 (/ (* l l) Om))) (* (* n (pow (/ l Om) 2)) (- U U*))))))