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Mathematical symbols. Pierre Herigone |
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Pierre Herigone (Latinized as Petrus Herigonius) (1580–1643) was a French mathematician and astronomer.
Of Basque origin, Herigone taught in Paris for most of his life.
He is the author of Cursus mathematicus, nova, brevi, et clara methodo demonstratus, per notas reales et universales, citra usum cujuscunque idiomatis intellectu faciles (published in Paris in six volumes from 1634 to 1637; second edition 1644), a compendium of elementary mathematics written in French and Latin. The work introduced a system of mathematical and logical notation. It has been said that "Herigone introduced so many new symbols in this six-volume work that some suggest that the introduction of these symbols, rather than an effective mathematics text, was his goal."[1] Florian Cajori has written that the work contains "a full recognition of the importance of notation and an almost reckless eagerness to introduce an exhaustive set of symbols..."[2] Herigone may have been the first to introduce the mathematical symbol to express an angle. He used both the symbol below and recorded the use of "<" as a symbol denoting "less than."
He also introduced the upside-down "T" symbol to express perpendicularity.
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