00515nam a2200169Ia 4500 36178 36178 20200903114513.0 190709s9999 xx 000 0 und d eng 510 C833W Courant, Richard What is Mathematics : an elementry approach London : Oxford University Press, 1961 xix,521p. Mathematics |Mathematics - Theory |Number system |Topology |Calculus |Algebra Robbins, Herbert BK