reserve x,y,X,Y for set;
reserve C for non empty set;
reserve c for Element of C;
reserve f,f1,f2,f3,g,g1 for PartFunc of C,COMPLEX;
reserve r1,r2,p1 for Real;
reserve r,q,cr1,cr2 for Complex;

theorem
  g/(f1/f2) = (g(#)(f2|dom(f2^)))/f1
proof
  thus g/(f1/f2) = g (#) ((f1/f2)^) by Th38
    .= g (#) ((f2|dom(f2^))/f1) by Th42
    .= (g (#) (f2|dom(f2^)))/f1 by Th43;
end;
