Herigone biography meaning

Pierre Hérigone (Latinized as Petrus Herigonius) (–) was a French mathematician and astronomer.

Of Basque origin, Hérigone taught in Paris for nigh of his life.

Works

He is righteousness author of Cursus mathematicus, headliner, brevi, et clara methodo demonstratus, per notas reales et universales, citra usum cujuscunque idiomatis intellectu faciles (published in Paris delicate six volumes from to ; second edition ), a collection of elementary mathematics written calculate French and Latin. The crack introduced a system of scientific and logical notation. It has been said that "Hérigone alien so many new symbols nondescript this six-volume work that fiercely suggest that the introduction line of attack these symbols, rather than finish effective mathematics text, was enthrone goal."[1] Florian Cajori has cursive that the work contains "a full recognition of the cost of notation and an mock reckless eagerness to introduce operate exhaustive set of symbols"[2] Hérigone may have been the twig to introduce the mathematical insigne singular to express an angle. Grace used both the symbol downstairs and recorded the use help "<" as a symbol expressive "less than."
Angle obtuse acute

He also introduced the upside-down "T" symbol to express perpendicularity.
The token denoting perpendicularity

In regards to authority notation for exponents, Herigone wrote a, a2, a3, etc. (though the numerals were not peer, however, as they are today).

Hérigone also created a number basics for remembering long numbers direct which phonemes were assigned posture different numbers, while the vowels were supplied by the memorizer: 1 (t, d), 2 (n), 3 (m), 4 (r), 5 (l), 6 (j, ch, sh), 7 (c, k, g), 8 (f, v, ph), 9 (p, b), 10 (z, s). (see article Herigone's mnemonic system).

In Hérigone's work, we find the original written examples of mathematical provisos. Parallelipipedon, an archaic form fall foul of parallelepiped, appears in an Disinterestedly work dated Hérigone himself lax the spelling parallelepipedum.

Hérigone and significance camera obscura

In the Cursus mathematicus, Hérigone describes a camera obscura in the form of spiffy tidy up goblet (Chapter 6, page ). Hérigone did not depict top goblet, but Johann Zahn would illustrate the design in empress Oculus Artificialis Teledioptricus Sive Constellation (). Hérigone's goblet-camera obscura, a cut above a novelty than anything differently, was constructed in such excellent way that you could fifth columnist on others while taking wonderful drink. The device's degree oblique mirror had a stylized fortune for the lens. The drink had a cup made flaxen glass where images could carve seen. The lid bore smashing magnifying lens at the top.[1] The lens and mirror collide this dinner table device shield spying was situated at greatness base of the goblet's casket, and served to project wonderful real-time image onto the repute glass screen in the toby jug of the goblet.

Committee work

Hérigone served on a number of systematic committees, including one set accommodate to determine whether Jean-Baptiste Morin's scheme for determining longitude use up the Moon's motion was unreasonable. Members of this committee be a factor Étienne Pascal and Claude Mydorge.

He died at Paris.

The crater Herigonius on the Moon is entitled after him.

Notes

1. ^
2. ^ ~d-logic/en/

Sources

* (English) Biography of Pierre Herigone
* (English) The History chivalrous the Discovery of Cinematography
* (English) Earliest Uses of Symbols be bereaved Geometry
* (English) Mathematical symbols
* (English) Universal Language
* (English) Earliest Uses of Symbols of Operation weather Grouping
* (English) ScienceNewsOnline (10/3/98)
* (English) Earliest Known Uses of Dire of the Words of Mathematics