Average Error: 19.7 → 0.9
Time: 20.7s
Precision: 64
Internal Precision: 1152
\[\frac{1}{\sqrt{x}} - \frac{1}{\sqrt{x + 1}}\]
\[\sqrt{\frac{1}{(\left(\sqrt{x + 1}\right) \cdot x + \left(\left(x + 1\right) \cdot \sqrt{x}\right))_*}} \cdot \sqrt{\frac{1}{(\left(\sqrt{x + 1}\right) \cdot x + \left(\left(x + 1\right) \cdot \sqrt{x}\right))_*}}\]

Error

Bits error versus x

Target

Original19.7
Target0.6
Herbie0.9
\[\frac{1}{\left(x + 1\right) \cdot \sqrt{x} + x \cdot \sqrt{x + 1}}\]

Derivation

  1. Initial program 19.7

    \[\frac{1}{\sqrt{x}} - \frac{1}{\sqrt{x + 1}}\]
  2. Using strategy rm
  3. Applied frac-sub19.7

    \[\leadsto \color{blue}{\frac{1 \cdot \sqrt{x + 1} - \sqrt{x} \cdot 1}{\sqrt{x} \cdot \sqrt{x + 1}}}\]
  4. Applied simplify19.7

    \[\leadsto \frac{\color{blue}{\sqrt{x + 1} - \sqrt{x}}}{\sqrt{x} \cdot \sqrt{x + 1}}\]
  5. Using strategy rm
  6. Applied flip--19.4

    \[\leadsto \frac{\color{blue}{\frac{\sqrt{x + 1} \cdot \sqrt{x + 1} - \sqrt{x} \cdot \sqrt{x}}{\sqrt{x + 1} + \sqrt{x}}}}{\sqrt{x} \cdot \sqrt{x + 1}}\]
  7. Applied simplify0.4

    \[\leadsto \frac{\frac{\color{blue}{1}}{\sqrt{x + 1} + \sqrt{x}}}{\sqrt{x} \cdot \sqrt{x + 1}}\]
  8. Using strategy rm
  9. Applied add-sqr-sqrt0.6

    \[\leadsto \color{blue}{\sqrt{\frac{\frac{1}{\sqrt{x + 1} + \sqrt{x}}}{\sqrt{x} \cdot \sqrt{x + 1}}} \cdot \sqrt{\frac{\frac{1}{\sqrt{x + 1} + \sqrt{x}}}{\sqrt{x} \cdot \sqrt{x + 1}}}}\]
  10. Applied simplify0.9

    \[\leadsto \color{blue}{\sqrt{\frac{1}{(\left(\sqrt{x + 1}\right) \cdot x + \left(\left(x + 1\right) \cdot \sqrt{x}\right))_*}}} \cdot \sqrt{\frac{\frac{1}{\sqrt{x + 1} + \sqrt{x}}}{\sqrt{x} \cdot \sqrt{x + 1}}}\]
  11. Applied simplify0.9

    \[\leadsto \sqrt{\frac{1}{(\left(\sqrt{x + 1}\right) \cdot x + \left(\left(x + 1\right) \cdot \sqrt{x}\right))_*}} \cdot \color{blue}{\sqrt{\frac{1}{(\left(\sqrt{x + 1}\right) \cdot x + \left(\left(x + 1\right) \cdot \sqrt{x}\right))_*}}}\]

Runtime

Time bar (total: 20.7s)Debug logProfile

herbie shell --seed '#(1064269945 2896236262 301053905 1701069080 1701464310 1614783279)' +o rules:numerics
(FPCore (x)
  :name "2isqrt (example 3.6)"

  :herbie-target
  (/ 1 (+ (* (+ x 1) (sqrt x)) (* x (sqrt (+ x 1)))))

  (- (/ 1 (sqrt x)) (/ 1 (sqrt (+ x 1)))))