This question would have been better posted in p.u.patches, but since it's
much easier to explain with images, I'll just post this question here.

  I have problems understanding the & operator in isosurface functions.
I had the impression that it's equivalent to the CSG intersection, ie.
"f1(x,y,z) & f2(x,y,x)" is 'solid' or true at a specific <x,y,z> if and
only if both f1(x,y,z) and f2(x,y,z) are 'solid'/true at that point. This
is equivalent to the intersection CSG.

  So if I have this function:

function { y-x }

  I get this:

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