Jean-Robert Argand was a Swiss mathematician best known for his work in the field of complex numbers. He is particularly noted for the development of the Argand diagram, which is a graphical representation of complex numbers on a two-dimensional plane. In this diagram, the horizontal axis represents the real part of a complex number, while the vertical axis represents the imaginary part. The Argand diagram provides a visual way to understand complex numbers, operations on them, and their geometric interpretations.
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