International Mathematical Congress
Klein was a strong believer in international collaboration in mathematics. Georg Cantor, whose efforts led to the founding of the German Mathematical Society, believed in the same. Their goals were the same, but they were both motivated by different personal reasons. Cantor felt that his close colleagues were unfairly criticizing his work, so he wanted a bigger platform to promote his ideas. Klein had strong ideas about math education and math research, and he was a great organizer who wanted to see his ideas on a bigger stage.