The French translation of ‘a black hole has no hair’ is so obscene that French publishers resisted it vigorously, to no avail. - Kip S. Thorne

Can you identify in your own life speculations that became educated guesses and then truth? Have you ever seen your established truths upended, with a resulting revolution in your life?

Some segments of this book may be rough going. That's the nature of real science. It requires thought. Sometimes deep thought. But thinking can be rewarding. You can just skip the rough parts, or you can struggle to understand.

El cálculo, la teoría de variable compleja, la teoría cualitativa de ecuaciones diferenciales, la teoría de grupos y la geometría diferencial estaban cubiertas;