i.e. integral is not calculate
(%i2) changevar(%, log(y)/log(2)=x, y, x);
(%i3) ev(%, nouns);
(%i4) risch(1/2^x, x);
(%i7) quad_qags(1/2^x, x, 0, 1);
Fixed in solve.lisp - extend solve to handle 2^x = 0 => no solution
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