sentences:  This is a rather ironic demonstration of Bahnsen's idea of "existence as contradiction", as Bahnsen and Hartmann's interest in both philosophers both drew them together "and" created contention within their friendship.Hartmann criticized Bahnsen's pluralism and claimed that the common point between all "individual wills" is a singular will.Whilst Bahnsen criticized Hartmann, claiming that his "Hegelian rationalism" corrupted the teachings of Schopenhauer's essentially purposeless will.