Czech and Slovak mathematicians

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Bernard Bolzano
Eduard Čech
Miloslav Valouch and Juraj Hronec Jur Hronec Karel Petr

Stamps with borders link to the expected biographies in the renowned MacTutor Archive [the prime online source for mathematical history] hosted by the historical University of St. Andrews. Without border they link to biographical entries in a recently started modest Czech version. This latter archive [in Czech] is hosted by the Masaryk University in Brno. It contains not only biographies of Czech mathematicians but also of many German-speaking mathematicians [of the second half of the 19th century], who have worked in the area now called the Czech republic. It also contains Czech biographies of Bernard Bolzano and Eduard Čech.
Counterexamples in Topology     You will find much on Čech-Stone compactifications in sections 110-113 of Steen & Seebach's popular "Counterexamples in Topology" and here is a personal reference related to section 58.5:  Jesus Ferrer (problem), A.A.Jagers (solution), Problem 6590[1989,65], American Mathematical Monthly, 97 No.10 p.934 (1990).   My first topology book, bought at "de Slegte" in Utrecht, was Čech's "Topological Spaces" [Revised edition by Zdeněk Frolíc & Miroslav Katětov]. Topological Spaces As a tribute I quote Theorem 41 D.5. [the main theorem on Čech-Stone compactifications]: Every uniformizable space has a Čech-Stone compactification, and each of the following conditions is necessary and sufficient for a compactification C of a uniformizable space P to be a Čech-Stone compactification of P:
    (a)   C is a finest compactification of P.
    (b)   The Čech uniformity of C is a completion of the Čech uniformity of P.
    (c)   Each bounded continous function on P has a continuous extension to C.
    (d)   Each continuous mapping from P into a uniformizable compact space has a continuous domain-extension to C.


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A.A. Jagers
The lattice (a 3-cube in this case) of all subfields of the finite field of order 230


the Slovak WMY2k stamp

In June 2003 we visited the Czech and Slovak republics with, what a pleasure to read, the rough guide at hand. While walking on the main street of the small town of Kežmarok, from the beautiful wooden Articular Church [with a capacity of nearly 1500 attendants!] to the former Thököly castle, my eye fell on a plaquette commemorating Hronec's 16 years as head of the renowned local grammar-school. The other mathematician, on the stamp, is Štefan Schwarz. He wrote a thesis on reducibility of polynomials over finite fields, which should explain the lattice in the middle [his supervisor Karel Petr appears on another stamp, at the top of this page]. Schwarz most important work was in semigroup theory. Some 35 years ago I enjoyed reading the classical book of A.H.Clifford & G.B.Preston on this subject, prompted by my first room-mate in Twente, Anton Jetten.