SURFACING
        If you find mathematics intriguing  or  if  you find
        mathematics˙forbidding,  †SURFACING‡  brings  you  the
        beauty of 3 Dimensional˙Surfaces and  an opportunity
        to explore mathematics visually. What˙has previously
        been   hostile   territory   to   even   those   who
        enjoy˙mathematics  and graphing is now open for  all
        to observe its rich˙beauty. This area of mathematics
        really can be explored by anyone˙with an interest in
        doing   so.   No    longer   does   it   require   a
        long˙apprenticeship in the study of mathematics.

        With ease and  speed  you can enter any two variable
        mathematical˙function and find out how it behaves in
        space.  Simply enter any˙equation and discover  what
        will  happen.  Once you have  used˙†SURFACING‡  for  a
        while, you will know what type of equations to˙enter
        to generate a certain kind of surface.  The surfaces
        that˙are  generated  are  often intriguing, exciting
        and beautiful.

        †SURFACING‡  (and  POLYNOMIAL   for   single  variable
        equations)  removes˙the  tedium  and  therefore  the
        error and frustration, from˙graphing. This leaves it
        as  an  enjoyable  pastime rather than an˙obligatory
        drudgery.

        †SURFACING‡  comes  with complete  documentation  that
        allows  anyone  to˙explore  this  rich  mathematical
        landscape.

        †SURFACING‡ requires a Texas Instruments  Professional
        Computer  or  Business  Pro  with  3-plane  graphics
        board, 256K memory, one  disk˙drive,  MS-DOS  2.1 or
        later and the 8087 coprocessor chip.˙†SURFACING‡ sells
        for $27.50.

/*Gsfeg1.pic:Surface 1,Gsfeg2.pic:Surface 2
27.50