Envisioning the modern foundations of differential geometry via the notion of (differentiable, smooth) manifolds and of what camed to be called Riemannian geometry:
Bernhard Riemann, Über die Hypothesen, welche der Geometrie zu Grunde liegen, Göttingen (1845) [doi:10.1007/978-3-642-35121-1]
Engl. transl: William Clifford: On the hypotheses which underlie geometry, Nature VIII (1873) 183-184 [doi:10.1007/978-3-319-26042-6]
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