i had no idea the proof by contradiction was postulated by Hippocrates of Chios. either that, or i had forgotten all about it.
thanks for reminding us.
the book i am reading now is Captains and Kings by Taylor Caldwell.
It's a kind of 'conspiracy theory meets Dynasty' novel, that left a huge impression on me decades ago, and i have decided to reread it.
Thanks for commenting @koskl!
Re-reading a book usually gives a slightly different dimension :)