
        May 1989

        Dear Einstein User,

        On this disk you will find two files:

        EINSTEIN.PRG
        EINSTEIN.RSC

        It is exceedingly important that these files are put in the same
        directory or folder!

        Using this program requires a bit mathematics knowledge at
        academic level.
      
        You can select out of two polynoms (up to third grade) which
        you can analyse. Polynoms of any higher grade are too difficult
        to analyse -> following the analalitic road.

        After you have selected two polynoms and entered their
        parameters, you can analyse them as a fraction.

        It is always nice to know what shape these functions have, so
        you can select the same item, but now they are not analysed 
        but are drawn on your screen. It is NOT possible to break 
        during the polynom or fraction is drawn.

        After the polynom or fraction is drawn you can select 
        a few options:

        Move axis - You can move the center of the axis to any place
                    on the screen.

        Zoom      - When you selected this item you can choose out of
                    zoom in or zoom out. It is only possible to
                    vary the Y-axis in range. 
                    X-axis range is always 16 (-8 to 8 when axis centered)

        Home view - After removing your axis and/or setting a zoom you 
                    can reset them to default values.
                    
        It only possible to select these items after a polynom or fraction
        is drawn. Direct after you have selected on of these items 
        the same polynom or fraction is drawn with the new settings.


        Their are a few additional options which can illustrate your 
        drawing:

        Asymptotes - The vertical and/or horizontal asymptote(s) are
                     shown or are hidden.

        First Diversion - The first diversion (y') is shown or is
                           hidden.

        You can select these items any time. When they are active 
        a marker is put before the item.

 
        Two options remain:

        X,Y axis    - You can check additional function values.

        Screen dump - This allows you to make a Hardcopy of your
                      drawing. You can select out of draft or final.
                      Draft is the standart Epson hardcopy (960 Dpi). 
                      Final takes a 'bit' longer (30 minutes) than Draft,
                      but it is the absolute winner among the hardcopies.  

        
        An error might occur when you have entered some very
        hypothetical polynoms to form a fraction, of course
        this seldom happens.
       
        Please write to the address below if errors occur or
        when you have some advices to optimice this program.

        Excalibur Software Development
        c/o H.W.A. Teunissen
        Graetheide 15
        6121 RL  Born
        the Netherlands (Europe)

        Thanks for reading this.


        Yours faithfully,

        Excalibur Software Development
        (Copyright May 1989)


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