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         Rudolff Christoff:     more detail
  1. Christoff Rudolff: An entry from Gale's <i>Science and Its Times</i> by Judson Knight, 2001

81. Earliest Uses Of Symbols Of Operation And Grouping
2, page 78). The radical symbol first appeared in 1525 in Die Coss by ChristoffRudolff (14991545). He used (without the vinculum) for square roots.
http://www.veling.nl/anne/templars/operation.html
Earliest Uses of Symbols of Operation and Grouping
Last revision: Aug. 15, 1997
ADDITION AND SUBTRACTION SYMBOLS
Plus (+) and minus (-). The plus symbol as an abbreviation for the Latin et (and), though appearing with the downward stroke not quite vertical, was found in a manuscript dated 1417 (Cajori).
The + and - symbols first appeared in print in Mercantile Arithmetic or Behende und hubsche Rechenung auff allen Kauffmanschafft , by Johannes Widmann (born c. 1460), published in Leipzig in 1489. However, they referred not to addition or subtraction or to positive or negative numbers, but to surpluses and deficits in business problems (Cajori vol. 1, page 128).
Cajori says, "There is clear evidence that, as a lecturer at the University of Leipzig, Widmann had studied manuscripts in the Dresden library in which + and - signify operations, some of these having been written as early as 1486." Johnson (page 144) says a series of notes from 1481, annotated by Widmann, contain the + and - symbols, and he asks whether Widman could have copied these symbols from some unknown professor at the University of Leipzig. Johnson also says that a student's notes from one of Widmann's 1486 lectures show the + and - signs.
Giel Vander Hoecke used + and - as symbols of operation in Een sonderlinghe boeck in dye edel conste Arithmetica

82. Sciscape°Q½×°Ï :: Æ[¬Ý¤å³¹ - 0!
The summary for this Chinese (Traditional) page contains characters that cannot be correctly displayed in this language/character set.
http://www.sciscape.org/phpBB2/viewtopic.php?p=25432&sid=bcedcfea814f129f9ca7a48

83. Sciscape°Q½×°Ï :: À˵ø¥DÃD - 0!
The summary for this Chinese (Traditional) page contains characters that cannot be correctly displayed in this language/character set.
http://www.sciscape.org/phpBB2/posting.php?mode=topicreview&t=14545&sid=5099b443

84. 2000 ”N‚Ì Column
Translate this page The summary for this Japanese page contains characters that cannot be correctly displayed in this language/character set.
http://www.nn.iij4u.or.jp/~hsat/column/col00.html
2000 ”N‚Ì column
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David Hilbert (18621943) ‚ªŒ¾‚Á‚½Œ¾—t —L–¼‚È de Moivre ‚ÌŒöŽ®‚Í de Moivre (16671754, UK) ‚Ì’˜ì u‹‰”‚Æ‹Ï‚ÉŠÖ‚·‚鐔ŠwŽG˜^v (London, 1730) ‚̈ê•Å–ڂɏo‚Ä‚¢‚é‚Æ‚¢‚¤B —L–¼‚È“ñ€’藝‚Ì”­Œ©‚Í Sir Isaac Newton (16421727) ‚Å, 1665 ”N ‚Ì‚±‚Æ‚Å‚ ‚é‚Æ‚¢‚¤B •¶Œ£“I‚É‚Í 1676 ”N 6 ŒŽ 13 “ú•t‚̎莆‚Ì’†‚ɏ‰‚ß‚ÄŒ©‚ç‚ê‚é‚Æ‚¢‚¤B ƒJƒWƒ‡ƒŠ u‰“™”ŠwŽjv (‹¤—§o”Å, p. 340 ŽQÆ) ‚£³m, ”ŠwŽÒ¥”ŠwŽj‰Æ
dx ‚Æ dy ‚̉ðÍŠw -ƒIƒCƒ‰[‚ÉŠw‚Ô-
II. ƒIƒCƒ‰[‚̐¢ŠE (‚»‚Ì2)
”ŠwƒZƒ~ƒi[ (8), 1999 Ž©‘R‘ΐ”‚Ì’ê e ‚Ì‚±‚Æ‚ð‘o‹Èü‘ΐ”‚ƌĂԂ±‚Æ‚ª‚ ‚é‚Ì‚¾‚»‚¤‚¾B ‚±‚ê‚Í’¼Šp (“™•Ó) ‘o‹Èü xy = 1 ‚Æ x Ž², “ñ’¼ü x = 1, x = t ‚ň͂܂ê‚é•”•ª‚Ì–ÊÏ S ‚ª S = ç x
ƒJƒWƒ‡ƒŠ ¢‰“™”ŠwŽj£ (‹¤—§o”Å) p.235ŽQÆ‚Ì‚±‚ƁB ŽO•Ó‚Ì’·‚³‚ª‘S‚Đ®”‚Å‚ ‚éŽOŠpŒ`‚É‚¨‚¢‚Ä, ‚»‚ê‚çŽO•Ó‚̘a‚Æ‚»‚̖ʐςƂª“™‚µ‚­‚È‚é‚悤‚ÈŽOŠpŒ`‚Í, ‚»‚ÌŽO•Ó‚Ì’·‚³‚ª, (6, 8, 10), (5, 12, 13), (9, 10, 17), (7, 15, 20), (6, 25, 29) ‚Å‚ ‚é‚à‚Ì‚ÉŒÀ‚éB (‚±‚ê‚ç‚Í‘S‚Ä, ®”•Ó’·‚Ì’¼ŠpŽOŠpŒ` [ƒsƒ…ƒ^ƒSƒ‰ƒXŽOŠpŒ`] ‚©‚çƒsƒ…ƒ^ƒSƒ‰ƒXŽOŠpŒ`‚ð uˆø‚¢‚½v ‚à‚Ì‚É‚È‚Á‚Ä‚¢‚é) ‚»‚µ‚Ä (®”•Ó’·‚Å‚Í‚È‚­‚Æ‚à) ŽO•Ó‚̘a‚ƖʐςƂª“™‚µ‚¢ŽOŠpŒ`‚É‚¨‚¢‚Ä‚Í, ‚»‚Ì“àÚ‰~‚Ì”¼Œa‚Í2‚É‚È‚éB ‰~‚̃R[ƒc‚̐«Ž¿: x k=1 n (x2 - 2x cos((2k - 1)ƒÎ/(2n)) + 1).

85. Human Indexes Of My Books On Mathematics; Ru Re Ro In Japanese
Translate this page The summary for this Japanese page contains characters that cannot be correctly displayed in this language/character set.
http://www.com.mie-u.ac.jp/~kanie/tosm/humanind/jinmeir3.htm
TOSMŽOd‚̃z[ƒ€
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(Louis XIV, 1638-1715.)
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