PRELIMINARIES

I am a retired engineer. Thanks to an adapted software, I am able to display the representation of mathematical curves and surfaces.

I enter the equation of the curve or surface in explicit, parametric, polar, cylindrical or spherical coordinates.

I choose parameters ( surface color, background color ...) and I obtain the curve or surface on the screen.

I can move the curves and surfaces in space, zoom, and change the lighting to improve the visibility of the surfaces.

I am able to carry out the intersection of a surface and a curve, or the intersections of two or several surfaces in the same way.

THANKS :

• to Gaspard MONGE (1746-1818), for having created the "Géométrie Descriptive".
• to his pupil Jean-Baptiste MEUSNIER DE LA PLACE (1754-1793), for his work on the surfaces curvature.
• to his disciple Charles DUPIN (1784-1873), for his work on the curvature lines of the surfaces.
• to C. ROUBAUDI, for his "Traité de Géométrie Descriptive" which was used as a "Bible" by the students of "Mathématiques Spéciales" of the Fifties.

Your comments will be welcome at my address : rmassouly@wanadoo.fr

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