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The process of defining the square root function for all complex numbers is analogous to the process of defining arccosh. First, we define square root to be what we expect for positive real numbers. Then we make a branch cut, in this case (−∞, 0]. Then we define it by analytic continuation for all values not on the cut. Then finally, we define it along the cut by continuity, taking the limit from above.,这一点在移动版官网中也有详细论述
"Before that, in much of Europe, you could love as many people as you like, and love was fluid, and it was often not about sex."