**Thomas J. Jech** ("Czech: *Tomáš Jech*, pronounced "[ˈtɔmaːʃ ˈjɛx]; born January 29, 1944 in "Prague) is a "mathematician specializing in "set theory who was at "Penn State for more than 25 years.

He was educated at "Charles University (his advior was "Petr Vopěnka) and is now at the Institute of Mathematics of the "Academy of Sciences of the Czech Republic.

Jech's research also includes "mathematical logic, "algebra, "analysis, "topology and "measure theory.

Jech gave the first published proof of the consistency of the existence of a "Suslin line. With Karel Prikry, he introduced the notion of precipitous ideal. He gave several models where "AC failed, for example one with ω_{1} "measurable. The concept of a "Jech–Kunen tree is named after him and "Kenneth Kunen.

- "Non-provability of Souslin's hypothesis",
*Comment. Math. Univ. Carolinae*,**8**: 291–305, 1967, "MR 0215729 *Lectures in set theory, with particular emphasis on the method of forcing*, Springer-Verlag Lecture Notes in Mathematics**217**(1971) ("ISBN "978-3540055648)*The axiom of choice*, North-Holland 1973 (Dover paperback edition "ISBN "978-0-486-46624-8)- (with K. Hrbáček)
*Introduction to set theory*, Marcel Dekker, 3rd edition 1999 ("ISBN "978-0824779153) *Multiple forcing*, Cambridge University Press 1986 ("ISBN "978-0521266598)^{[1]}*Set Theory*, 3rd millennium (revised) ed., 2003, Springer Monographs in Mathematics, Springer, "ISBN "3-540-44085-2 is the standard graduate level text. 1st ed. 1978;^{[2]}2nd (corrected) ed. 1997

**^**"Baumgartner, James (1989). "Review:*Multiple forcing*by Thomas Jech" (PDF).*Bull. Amer. Math. Soc. (N.S.)*.**20**(1): 103–107. "doi:10.1090/s0273-0979-1989-15716-9.**^**"Kunen, Kenneth (1980). "Review:*Set theory*by Thomas Jech" (PDF).*Bull. Amer. Math. Soc. (N.S.)*. 3, Part 1 (1): 775–777. "doi:10.1090/S0273-0979-1980-14818-1.

- Home page, with a copy at Penn state.
- Thomas Jech at the "Mathematics Genealogy Project