To map two scalar numeric values (x0,x1) to two other scalar values (y0,y1):

   - Plot the graph (x0,y0) and (x1,y1).  Find the y-intercept s and slope
   m.  The mapping is s+m*x.  Simplify for particular values of s and m.  If
   y0/y1 is 0, or if y0/y1 is 1, or if x0/x1 is boolean, there are functions
   you can exploit, such as ^ or * .
   - ((x0,x1)i.x){(y0,y1).  Simplify for specific domains.  For example if
   x is known to be boolean you can simplify 0 1 i. x to just x .
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