MIT Open CourseWare
Salman Khan's classroom
F. Klein's Erlangen program (translated by M.W. Haskell)
Euclid's Elements (by D. E. Joyce)
Riemann's Habilitation Dissertation (translated by W. K. Clifford)
S. Banach's 'Théorie des opérations linéaires'
David Hilbert's 'The Foundations of Geometry'
Euler's 'Recherches sur la courbure des surfaces'
S. Lie's 'Transformation Groups' (translated by M. Ackerman, comments by R. Hermann)
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