hyperbolic substitution

• 双曲代换

hyperbolic substitution的用法和样例：

例句

1. We see immediately that after substitution the real part of each term is 0.
   我们立即看出，在代换之后，每项的实数皆为零。
2. In fact, we could make the substitution and still wind up with the correct eigenfunctions and eigenvalues.
   事实上，我们可以做这种代换而仍能绕弯得出正确的本征函数和本征值。