[color=#000000][size=150][size=200]Calculus: Tricky calculations with difference quotients or product sums.[br]A typical problem for teaching and learning: [br][b]calculating without comprehending[/b].[br][br][/size][/size][size=200]Learning Environments for a graphical and (for the students) calculation-free approach to calculus:[br][list][*][b]Function Loupe[/b] [br][/*][*][b]Integrator[/b].[br][/*][/list]Computing power and dynamic visualiation instead of term manipulations.[/size][/color]