Introducing the modern notion of vector spaces:
Giuseppe Peano, Calcolo Geometrico secondo l’Ausdehnungslehre di H. Grassmann preceduto dalle Operazioni della Logica Deduttiva, Fratelli Bocca Editori, Torino, 1888, pp. XI, 171 Mathematica Italiana opere 138, pdf
(referring to Hermann Grassmann‘s Ausdehnungslehre)
Introducing the Peano curve:
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