Hamlet and Pfister forms (A tragedy in four acts)

Details Hamlet and Pfister forms (A tragedy in four acts) Hamlet and Pfister forms (A tragedy in four acts)

2009-11-13

arxiv.org/abs/0911.2529v1

Mathematics

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9 pages

Scientific paper

In the mid-1960s A. Pfister discovered extraordinary, strongly multiplicative forms which are now called Pfister forms. From that time on, these forms played a dominant role in the theory of quadratic forms. One of the key properties of a Pfister form q is that q extended to a suitable transcendental extension, has the polynomial q as its similarity factor. Pfister's original proof used clever matrix calculations. Here we show that the desired isometry is induced by the multiplication of a suitable field element. We further consider the surprising possibility that Pfister's forms were already known by Hamlet, Rosencrantz and Guildenstern, and that they in fact led to a terrible tragedy which is yet filled with a haunting beauty and mystery that can still inspire us to this day.

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