In The Irrationals, the first popular and comprehensive book on the subject, Julian Havil tells the story of irrational numbers and the mathematicians who have tackled their challenges, from antiquity to the twenty-first century.
Nicholas realized he was powerless. Tsar Nicholas II abdicated the throne on March 2, (according to the Russian Julian calendar; March 15 according to the western Gregorian calendar), in 1917. He signed an abdication document stepping down from the throne and nominating his brother Michael to succeed him.
Reza Shah then decided to abdicate, to allow his son and heir, Mohammad Reza Pahlavi, to adopt a policy appropriate to the new situation, and to preserve his dynasty. He wanted to go to Canada, but the British government sent him first to Mauritius and then to Johannesburg, where he died in July 1944.