However , he did not attend .
Pervushin was a contributor to the International World Congress of Mathematicians of 1893 , a part of the World 's Columbian Exposition in Chicago that became a precursor to the later International Congresses of Mathematicians .
Pervushin did not attend .
Pervushin was a contributor to the International World Congress of Mathematicians of 1893 , a part of the World 's Columbian Exposition in Chicago that became a precursor to the later International Congresses of Mathematicians .