decimal expansion
61Madelung constant — The Madelung constant is used in determining the energy of a single ion in a crystal. It is named after Erwin Madelung, a German physicist. [E. Madelung, Phys. Zs. 19, (1918), 542] Because the anions and cations in an ionic solid are attracted to …
62Gregory, James — ▪ Scottish mathematician and astronomer also spelled James Gregorie born November 1638, Drumoak [near Aberdeen], Scot. died October 1675, Edinburgh Scottish mathematician and astronomer who discovered infinite series representations for a …
63Logarithmic scale — A logarithmic scale is a scale of measurement that uses the logarithm of a physical quantity instead of the quantity itself. Presentation of data on a logarithmic scale can be helpful when the data covers a large range of values ndash; the… …
64MIDI (disambiguation) — Midi may refer to: Contents 1 Music 2 Entertainment 3 People 4 Places 5 Other …
65Unique prime — In mathematics, a unique prime is a certain kind of prime number. A prime p ≠ 2, 5 is called unique if there is no other prime q such that the period length of the decimal expansion of its reciprocal, 1 / p , is equivalent to the period length of …
662000 (number) — 2000 (two thousand) is the natural number following 1999 and preceding 2001.See also: millennium, year 2000 AD, Y2K, 2000 (disambiguation).Two thousand is the highest number expressible using only two unmodified characters in roman numerals… …
67Yasumasa Kanada — is a Japanese mathematician most known for his numerous world records over the past two decades for calculating digits of π. He has set the record 9 of the past 11 times.Kanada is a professor in the Department of Information Science at the… …
68Look-and-say sequence — The lines show the growth of the numbers of digits in the look and say sequences with starting points 23 (red), 1 (blue), 13 (violet), 312 (green). These lines (when represented in a logarithmic scale) tend to straight lines whose slopes coincide …
69142857 (number) — 142,857 is the best known cyclic number in base 10. [ [http://www.daviddarling.info/encyclopedia/C/cyclic number.html Cyclic number ] , The Internet Encyclopedia of Science ] [Michael W. Ecker, [http://links.jstor.org/sici?sici=0049… …
70Adriaan van Roomen — (29 September 1561 4 May 1615), also known as Adrianus Romanus, was a Belgian mathematician. He was born in Leuven, where he became professor, but then travelled extensively in Europe. He worked in algebra, trigonometry and geometry; and on the… …
