126 1859-1938 1881-1956 1885-1962 20thcentury artists authors binswanger boer brouwer carlo carrà computers congresses constructivemathematics coralreefsandislands cornelisde correspondence digitalmedia edmund engineering environmentalaspects ethnology frank giovanni history hurley husserl imagingsystems intersubjectivity intuitionisticmathematics italian italianauthors italy logic ludwig mathematics other(philosophy) papini phenomenology photography reference research sequences(mathematics) socialaspects subjectivity symbolicandmathematical technology topology underwaterexploration underwaterphotography visualanthropology williamson