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Norbert Wiener, an American mathematician and philosopher, founder of cybernetics, was born on November 26, 1894.
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
Detailed view on vintage Mercedes Euklid 38 calculator (by Jaroslav Pochylý).