Thus，for instance，it may come as a shock to mathematicians to learn that the Schrodinger equation for the hydrogen atom is not a literally correct description of this atom，but only an approximation to a somewhat more correct equation taking account of spin，magnetic dipole，and relativistic effects；and that this corrected　equation is itself only an imperfect approximation to an infinite set of　quantum field-theoretical equations.

我的理解是：第二处highlighted的 this corrected equation 是否指代的是第一处highlighted的那个equation, 而不是指Schrodinger equation，

请NN指点一下我的理解有没有错，谢谢！