A Field Guide to AlgebraThis is a small book on algebra where the stress is laid on the structure of ? elds, hence its title. Youwillhearaboutequations, bothpolynomialanddi? erential, andabout the algebraic structure of their solutions. For example, it has been known for centuries how to explicitely solve polynomial equations of degree 2 (Baby nians, many centuries ago), 3 (Scipione del Ferro, Tartaglia, Cardan, around th 1500a. d.), and even 4 (Cardan, Ferrari, xvi
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