Switch to a full design
Old menu (sorted by topic)
Mathematical Assistant on Web
Cookies are off. Your device will be detected automatically. Set cookies on to choose your own preference.
Change the setting to
W. Odhner got patent US209416 A on October 29, 1878. His invention turned to the first mass produced calculator. The application was submitted on July 13, 1878.
Derivative and partial derivative
First order ODE
Definite integral and mean value
Geometrical applications of definite integral
Local maxima and minima in two variables
Domain of functions (one variable)
Domain of functions (two variables)
Least squares method
Second order LDE
Fixed point iterations
Speed comparison for Marchant calculators, the fastest mechanical calculators in human history.
The rest of the