
The Legacy of Mario Pieri in Geometry and Arithmetic
Description
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A list of errata can be found on the author Smith's personal webpage.
Reviews / Votes
"This book portrays Pieri as an individual of exceptional ability, who responded to the influence of many of his contemporaries; and they, in turn, acknowledged the quality of Pieri's work. In fact, there is a sixty-page section in the first chapter containing biographical sketches of the lives and work of almost a hundred such mathematicians. Moreover, the general historical analysis and interpretative commentary, whilst focussing particularly upon the achievements of Mario Pieri, also extends to many of the general mathematical developments of his era. The book is very thoroughly documented and contains an abundance of photographic portraits. It culminates with an extensive bibliography and an accurately compiled index, and it will undoubtedly appeal to those concerned with the history of 'modern mathematics', as well as being of interest to the general readership specified by the authors." -MAA Reviews
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Content
This chapter contains an English translation of Pieri's 1908a memoir, Elementary Geometry Based on the Notions of Point and Sphere.1 The work had two main goals. First, it presented elementary Euclidean geometry as a hypothetical-deductive system, and showed that all its notions and postulates can be defined and formulated in terms of the notion point and the relation that holds between points a,b, c just when a,b are equidistant from c. As noted in section 5.2, this result gave rise, over decades, to a stream of related research that still continues. The paper's title reflects Pieri's extensive use of elementary set theory in developing geometry from his postulates: he defined the sphere through b centered at c as the set of all points a such that a and b are equidistant from c.
Pieri's second aim was to foster more extensive use of properties of spheres in presenting elementary geometry, even in school courses. In this regard, he seems to have had less impact, even though this memoir presents many useful examples. A third aim, which Pieri had already pursued for a decade, was to promote the use of transformations in elementary geometry. Pieri introduced various geometric transformations early through definitions, and employed them extensively throughout the paper, following paths already explored in his 1900a Point and Motion memoir. Finally, Pieri followed the strategy of fusionism in developing plane and solid geometry together.2
The translation is meant to be as faithful as possible to the original. Its only intentional modernizations are
punctuation,
bibliographic references, which have been altered to refer to entries in the bibliography of the present book,
rare changes in mathematical symbols, where Pieri's are inconsistent with today's mathematical practice, and
the use of a few common English mathematical terms invented more recently than Pieri's coinages, some of which were not widely adopted.3
Editorial comments [in square brackets like these] are inserted, usually as footnotes, to document changes in mathematical terms, to note or suggest corrections for occasional mathematical errors in the original, and to explain a few passages that seem particularly opaque. All [square] brackets in the translation enclose editorial comments.
The translation strategy results in a style of English mathematical exposition now regarded as old-fashioned, awkward and redundant. This may challenge a reader whose familiarity with English is limited to the styles now used in mathematical exposition. The strategy was adopted to minimize destruction of aspects of Pieri's work tied to his expository style.
Pieri employed very extensively the subjunctive mood and some other verb forms that are rare in modern English. This may have provided him shades of meaning available in today's usage only through wording that would differ considerably from his. In the translation, wording was selected that is as close to his as possible. Subjunctives and equivalent forms with auxiliary verbs are used in the translation much more than in conventional modern English, even in the translator's own writing. Readers should interpret some such instances as indications that Pieri may be shading his meaning differently from what might be conveyed by shorter, more familiar English expressions. In most cases, readers can proceed with the same caution they would use with English mathematical or philosophical prose written in Pieri's time or a decade or two earlier. But for a definitive interpretation, they should consult the original and someone more familiar than the translator with psychological nuances conveyed by Pieri's style.
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