Hahn's contributions to mathematics include the famous Hahn-Banach theorem and (independently of Banach and Steinhaus) the uniform boundedness principle. Other theorems are the Hahn decomposition theorem, the Vitali-Hahn-Saks theorem, the Hahn-Mazurkiewicz theorem and the Hahn embedding theorem.
Hahn's contributions to mathematics include the famous Hahn-Banach theorem and (independently of Banach and Steinhaus) the uniform boundedness principle.
When Hahn was asked about the changes that "Bread for the World" had experienced since 1969, he said that the most important was that the campaign was a "learning organisation": "we have learnt and I hope we will continue to learn".
Hahn named the reasons for the provisional non-membership: "we want the campaign "Bread for the World" to remain transparent as a fund-raising campaign, which it is in the structures of the church social services.
Hahn stresses at the same time his gratitude for the service which he has been allowed to perform for the past 30 years: "Gratitude is the keyword, now that I am leaving my job as a pastor and social service worker".