Jean-Robert Argand

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Jean-Robert Argand (Ginevra, 18 luglio 1768 – Parigi, 13 agosto 1822) è stato un matematico svizzero non professionista.

Nel 1806, mentre era il gestore di una libreria a Parigi, pubblicò a proprie spese un libro in cui veniva esposta l'idea dell'interpretazione geometrica dei numeri complessi.

Grazie a questo studio a lui e a Carl Friedrich Gauss è stato intitolato il piano di Argand-Gauss (Piano complesso), grafico che rappresenta in ascissa la parte reale del numero complesso e in ordinata la parte immaginaria, trasformando in questo modo un numero complesso in un vettore.

Tra i suoi contributi occorre anche ricordare una dimostrazione (non completamente corretta) del Teorema fondamentale dell'algebra; Argand sembra essere stato il primo a trattare il caso in cui i coefficienti possono anche essere numeri complessi.

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Controllo di autoritàVIAF (EN) 92070132 · ISNI (EN) 0000 0000 6645 8170 · CERL cnp00451793 · LCCN (EN) n84801874 · GND (DE) 12223832X · BNF (FR) cb12190253m (data) · J9U (EN, HE) 987007271485205171
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