Girolamo Cardano (1501 - 1576) was an Italian mathematician best known for his treatise entitled Ars Magna (Artis magnae sive de regulis algebraicis: The Art of Solving Algebraic Equations) in which he published the solutions of cubic equations (due to Tartaglia) and quartic equations (due to Ferrari). The Cardano's formula (commonly referred to as Cardan's formula) is named after him.