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Alfréd Rényi said that "A mathematician is a device for turning coffee into theorems". And October 1 is the International Cofee Day. Cofee stimulated not only mathematicians, but also computation algorithms, see the attached video.
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
How does the mechanical thing multiply? Detailed explanation how successive additions and carriage shifts are used in a calculator with automatic multiplication.
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