Eliyahu Rips

Eliyahu Rips ( _he. אליהו ריפס; _ru. Илья Рипс) (born 1948) - is an Israeli-Latvian mathematician known for his research in geometric group theory. He achieved public notoriety as a result of coauthoring a paper on the Bible codes.

Rips grew up in Latvia (then part of Soviet Union). He was the first high school student from Latvia to participate in the International Mathematical Olympiad. On 13 April 1969, Rips (who was a 20-year old graduate student at the University of Latvia at that time) attempted self-immolation in a protest against the Soviet invasion of Czechoslovakia. After that, he was incarcerated by the Soviet government but, under pressure from Western mathematicians, was allowed to emigrate to Israel in 1972.

After recovering from his wounds and finishing his Ph.D., Rips joined the Department of Mathematics at Hebrew University, Jerusalem. Rips received the Erdős prize from the Israel Mathematical Society in 1979 and was a sectional speaker at the International Congress of Mathematicians in 1994.

Rips' (mostly unpublished) work on group actions on $mathbb\; R$-trees has been widely influential. The Rips machine, in the hands of Rips and his student Zlil Sela, has proven to be effective in obtaining classification results such as a solution to the isomorphism problem for hyperbolic groups.

In 1994, Rips, together with Doron Witztum and Yoav Rosenberg, published an article in the journal "Statistical Science" which claimed that they have discovered encoded messages in the Hebrew text of the book of Genesis, a part of Bible. In 1997, their claim was then described in a popular book "The Bible Code" by journalist Michael Drosnin. Since then, Bible codes have been a subject of controversy and a refutation has been published by mathematician Brendan McKay and others [http://cs.anu.edu.au/people/bdm/dilugim/torah.html] . However, the methods used to conduct the refutations have been strongly questioned as well (see [http://www.aish.com/seminars/discovery/Codes/Primer/primer1.htm Primer on the Bible Code] , specifically, the section "The McKay... Paper"). See also this paper by Doron Witztum [ [http://www.torahcodes.co.il/emanuel/eman_hb.htm New Statistical Evidence for a Genuine Code in Genesis] ] on the issue.

Rips, once an atheist is now an Orthodox Jew [ [http://www.biblecodedigest.com/page.php/26 Bible Code Digest.com - Bible Code Website Links ] ]

elected papers

* E. Rips, "Group actions on R-trees", preprint
* E. Rips, "Subgroups of small cancellation groups." Bull. London Math. Soc. 14 (1982), no. 1, 45--47.
* Rips, E.; Sela, Z. "Structure and rigidity in hyperbolic groups. I." Geom. Funct. Anal. 4 (1994), no. 3, 337--371.
* Rips, E. Sela, Z. "Canonical representatives and equations in hyperbolic groups." Invent. Math. 120 (1995), no. 3, 489--512.
* Rips, E.; Sela, Z. Cyclic splittings of finitely presented groups and the canonical JSJ decomposition. Ann. of Math. (2) 146 (1997), no. 1, 53--109.
* Sapir, Mark V.; Birget, Jean-Camille; Rips, Eliyahu, "Isoperimetric and isodiametric functions of groups." Ann. of Math. (2) 156 (2002), no. 2, 345--466.
* Birget, J.-C.; Ol'shanskii, A. Yu.; Rips, E.; Sapir, M. V., "Isoperimetric functions of groups and computational complexity of the word problem." Ann. of Math. (2) 156 (2002), no. 2, 467--518.

References

ee also

*Vietoris–Rips complex

External links

* [http://www.bbc.co.uk/science/horizon/2003/biblecodetrans.shtml The Bible Code] , transcript of a story which aired on "BBC Two", Thursday 20 November 2003, featuring comments by Drosnin, Rips, and Brendan McKay.