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.
Franz Ferdinand decided to visit Sarajevo, the capital of Bosnia and Herzegovnia, to make an inspection of the Austro-Hungarian troops there. The inspection was scheduled for 28th June 1914.