1 كتب إلكترونية بواسطة Emil Molnár
András Prékopa & Emil Molnár: Non-Euclidean Geometries
‘From nothing I have created a new different world, ‘ wrote János Bolyai to his father, Wolgang Bolyai, on November 3, 1823, to let him know his discovery of non-Euclidean geometry, as we call it tod …
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