Some introductions
Tatsuyoshi Hamada (Fukuoka University / OCAMI, JAPAN)
Distance of Linz to Fukuoka is 8945 kilometers.
Chief editor of MathLibre Project. http://www.mathlibre.org/
We have over 100 mathematical software systems in one DVD.[br]You can download DVD ISO image from our website, it's an open source project.[br][br]If you're familiar with Linux and GitHub, you can modify it and make your native language edition. Of course, you can redistribute it, freely.
The Derivative of a function
The derivative is presented as the slope of the tangent line to a graph of a curve. This gives the definition of the derivative of a real-valued function [math] f: R [math]\rightarrow R [/math][/math]