Argand (angolul)
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Definíció (óvodás)
Jean Robert Argand (1768-1822): A Swiss mathematician. He is remembered for his geometrical interpretation of the complex numbers, where i is interpreted as a rotation through 90°, and for the concept of the modulus of a complex number. His best work was on the fundamental theorem of algebra.
Támogatók: EU Socrates Minerva, HeyMath!, Cambridge University Press