1 | initial version |

Thanks calc314 for the link to Wolfram Alpha. Quite a goldmine, there. Especially liked the 3d (2d real, 1d imaginary) plot of erf. Maybe someday I'll learn how to make a similar plot for the solution of y'+2xy =1.

Your code for the numerical approximation and the slope fields is very interesting.
I assume you used 1-x*y as a simplification: it doesn't change the shape of the curve in the maxima code plots much.
But when I plug in 1-2*x*y into your code, I have trouble with the y axis coordinates.
If I plug 1-2*x*y into your code, what is the best way to set the actual plot y coordinates back to say -0.8 to 0.8 and the x coordinates from -10 to 20?
Thanks again,
Bob

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