Eric W. Weisstein | |
---|---|

Born | Bloomington, Indiana, U.S. | March 18, 1969

Citizenship | United States |

Alma mater | Cornell University (BA), California Institute of Technology (MS and PhD) |

Known for | MathWorld , CRC Concise Encyclopedia of Mathematics , ScienceWorld |

Scientific career | |

Fields | Planetary astronomy, Physics, Mathematics |

Institutions | Wolfram Research |

Doctoral advisor | Dewey Muhleman |

**Eric Wolfgang Weisstein** (born March 18, 1969) is an American mathematician and encyclopedist who created and maintains the encyclopedias * MathWorld * and *ScienceWorld*. In addition, he is the author of the * CRC Concise Encyclopedia of Mathematics *. He works for Wolfram Research.

Weisstein holds a Ph.D. in planetary astronomy, which he obtained from the California Institute of Technology's Division of Geological and Planetary Sciences in 1996 as well as an M.S. in planetary astronomy in 1993 also from Caltech. Weisstein graduated cum laude from Cornell University with a B.A. in physics and a minor in astronomy in 1990. During his summers away from Cornell, Weisstein participated in research at the Arecibo Observatory, a radio telescope facility in Puerto Rico operated by Cornell. As a graduate student, Weisstein also participated in research at Goddard Space Flight Center in Greenbelt, MD. During his time at Goddard, Weisstein participated in the development of hurricane visualization software. In 1996 Weisstein published his doctoral thesis titled *Millimeter/Submillimeter Fourier Transform Spectroscopy of Jovian Planet Atmospheres*, which was completed under faculty advisor Dewey Muhleman and in association with Eugene Serabyn, who is now a member of the Caltech Jet Propulsion Laboratory.

Upon completion of his doctorate, Weisstein became a research scientist at Caltech in January 1996 and continued work in the field of submillimeter spectroscopy. He collaborated with Eugene Serabyn and published several papers. Six months later, he moved to the University of Virginia's Department of Astronomy in Charlottesville, VA where he remained for three years to continue his research.

In 1995, Weisstein converted a Microsoft Word document of over 200 pages to hypertext format and uploaded it to his webspace at Caltech under the title *Eric's Treasure Trove of Sciences.* After Weisstein transferred to the University of Virginia to continue his work in astronomy, he continued to refine his fledgling encyclopedia. In November 1998, Weisstein made a deal with the CRC Press to publish his encyclopedia in book format as the CRC Concise Encyclopedia of Mathematics. A year later, in 1999, Weisstein accepted the position of encyclopedist at Wolfram Research, Inc. (WRI). *MathWorld* was ready to be unveiled in December 1999 with nearly 13,000 entries, most of them written by Weisstein, encompassing a variety of disciplines, including algebra, geometry, calculus, discrete mathematics, topology, number theory, statistics, and the foundations.

*MathWorld* became involved in a legal dispute with the CRC Press in March 2000. The CRC Press claimed *MathWorld* violated the copyright on the CRC Concise Encyclopedia of Mathematics. During the dispute, a court order shut down *MathWorld* for over a year starting October 23, 2000. According to Eric Weisstein's personal site, he restarted MathWorld on November 6, 2001.^{ [1] } This ultimately led^{[ citation needed ]} to the creation of PlanetMath. Wolfram Research, Stephen Wolfram, and Eric Weisstein settled with the CRC Press for an undisclosed financial award and several benefits. Among these benefits are the inclusion of a copyright notice of the CRC Press at the bottom of all webpages in *MathWorld* and legal rights to reproduce *MathWorld* in a book format again.

*ScienceWorld*, also known as *Eric Weisstein's World of Science*, was unveiled to the general public in January 2002. *ScienceWorld* includes more than 1,000 entries in many fields of science including astronomy, chemistry, physics and biographies of scientists.

In 2014, he became a member of the Global Digital Mathematics Library Working Group of the International Mathematical Union.^{ [2] }

- ↑ "Updates about the CRC Lawsuit". Eric Weisstein. April 5, 2009.
- ↑ "The Global Digital Mathematical Library Working Group". Archived from the original on September 21, 2017. Retrieved January 22, 2015.

**Celestial mechanics** is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics to astronomical objects, such as stars and planets, to produce ephemeris data.

**PlanetMath** is a free, collaborative, mathematics online encyclopedia. The emphasis is on rigour, openness, pedagogy, real-time content, interlinked content, and also community of about 24,000 people with various maths interests. Intended to be comprehensive, the project is currently hosted by the University of Waterloo. The site is owned by a US-based nonprofit corporation, "PlanetMath.org, Ltd".

**Tau** is the 19th letter of the Greek alphabet, representing the voiceless dental or alveolar plosive IPA: [t]. In the system of Greek numerals, it has a value of 300.

In mathematics, a **constant function** is a function whose (output) value is the same for every input value. For example, the function *y*(*x*) = 4 is a constant function because the value of *y*(*x*) is 4 regardless of the input value x.

* MathWorld* is an online mathematics reference work, created and largely written by Eric W. Weisstein. It is sponsored by and licensed to Wolfram Research, Inc. and was partially funded by the National Science Foundation's National Science Digital Library grant to the University of Illinois at Urbana–Champaign.

The **versine** or **versed sine** is a trigonometric function found in some of the earliest trigonometric tables. The versine of an angle is 1 minus its cosine.

**Wolfram Research, Inc.** is an American multinational company that creates computational technology. Wolfram's flagship product is the technical computing program Wolfram Mathematica, first released on June 23, 1988. Other products include WolframAlpha, Wolfram SystemModeler, Wolfram Workbench, gridMathematica, Wolfram Finance Platform, webMathematica, the Wolfram Cloud, and the Wolfram Programming Lab. Wolfram Research founder Stephen Wolfram is the CEO. The company is headquartered in Champaign, Illinois, United States.

**Robert Benjamin Leighton** was a prominent American experimental physicist who spent his professional career at the California Institute of Technology (Caltech). His work over the years spanned solid state physics, cosmic ray physics, the beginnings of modern particle physics, solar physics, the planets, infrared astronomy, and millimeter- and submillimeter-wave astronomy. In the latter four fields, his pioneering work opened up entirely new areas of research that subsequently developed into vigorous scientific communities.

The **Caltech Submillimeter Observatory** (**CSO**) was a 10.4-meter (34 ft) diameter submillimeter wavelength telescope situated alongside the 15-meter (49 ft) James Clerk Maxwell Telescope (JCMT) at Mauna Kea Observatories. It was engaged in submillimeter astronomy, of the terahertz radiation band. The telescope closed on September 18, 2015. As of April 2019, the telescope is set to be dismantled and its site remediated in the near future as part of the Mauna Kea Comprehensive Management Plan.

In mathematics, the **boustrophedon transform** is a procedure which maps one sequence to another. The transformed sequence is computed by an "addition" operation, implemented as if filling a triangular array in a boustrophedon manner—as opposed to a "Raster Scan" sawtooth-like manner.

**Edgar van Tuyll** was the chief quantitative strategist of Pictet & Cie, where he worked from 1995 to 2017. He has been extensively quoted by the media for his prediction of the 2000 Dot-com bubble crash and of the bull market beginning in March 2003. He is among the minority of strategists expecting a US recession in 2007-2008. His website *Links to unsolved problems, prizes and research* is top ranked by Google for list of unsolved problems in mathematics and physics. He is the author of several entries in the "CRC Concise Encyclopedia of Mathematics", Chapman & Hall, 2002. He is the grandson of Antti Johannes Rantamaa.

In mathematics, the following matrix was given by Indian mathematician Brahmagupta:

**Edward Taylor Pegg Jr.** is an expert on mathematical puzzles and is a self-described recreational mathematician. He wrote an online puzzle column called Ed Pegg Jr.'s *Math Games* for the Mathematical Association of America during the years 2003–2007. His puzzles have also been used by Will Shortz on the puzzle segment of NPR's *Weekend Edition Sunday*. He was a fan of Martin Gardner and regularly participated in Gathering 4 Gardner conferences. In 2009 he teamed up with Tom M. Rodgers and Alan Schoen to edit two Gardner tribute books.

* CRC Concise Encyclopedia of Mathematics* is a bestselling book by American author Eric W. Weisstein.

In mathematics, the **theta operator** is a differential operator defined by

**Carrie Anderson** is an American planetary scientist at NASA's Goddard Space Flight Center.

A **tetradic****number**, also known as a **four-way****number**, is a number that remains the same when flipped back to front, flipped front to back, mirrored up-down, or flipped up-down. The only numbers that remain the same which turned up-side-down or mirrored are 0, 1, and 8, so a tetradic number is a palindromic number containing only 0, 1, and 8 as digits. The first few tetradic numbers are 1, 8, 11, 88, 101, 111, 181, 808, 818, ....

The **Hart circle** is externally tangent to and internally tangent to incircles of the associated triangles ,,, or the other way around.

- Eric Weisstein's Biography at
*MathWorld* - Eric Weisstein's Curriculum Vitae
- Eric Weisstein's Doctoral Thesis
- FAQ at
*ScienceWorld* - FAQ Archived February 16, 2004, at the Wayback Machine at
*MathWorld* - Weisstein, Eric (1999).
*CRC Concise Encyclopedia of Mathematics*. CRC Press.

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Images, videos and audio are available under their respective licenses.