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"The best fuzzy rules, the best knowledge, deal with the turning points of the system. If a race-car driver teaches you how to drive, you don't need him to show you how to drive on the straightaway. It's how he handles the curves that matters."
- Bart Kosko

Integral Calculator  
  A device that accepts complex equations and solves them.  

He scribbled some figures, checked them again sixty seconds later, then pulled little levers on the Integral Calculator. This amazing machine had only recently been improved to the point where it performed mathematical feats heretofore possible only to the greatest mathematicians. It juggles the abstruse fomula of the Calculus, Hamiltonian equations, vectors, quantums and world cures, as though they were elementary additions.

A series of figures danced across a lighted ribbon...

From Exiles of the Moon, by Nat Schachner (w. AL Zagat).
Published by Wonder Stories in 1931
Additional resources -

Compared to the Grantline Comptometer from Beyond the Stars (1928) by Ray Cummings.

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