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Helmut H. Schaefer
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<p>Helmut Heinrich Schaefer (February 14, 1925 in <a href="/facts/Gro%25C3%259Fenhain/TLLAEJJb">Großenhain</a>, <a href="/facts/Weimar_Republic/LYYS66ad">Weimar Republic</a> – December 16, 2005 in <a href="/facts/T%25C3%25BCbingen/j0rBaILv">Tübingen</a>, Germany) was a German mathematician, who worked primarily in <a href="/facts/Functional_analysis/MIp233MT">functional analysis</a>. His two best known scientific monographs are titled <i><a href="/facts/Topological_vector_space/XRex1ChN">Topological Vector Spaces</a></i> (1966) and <i>Banach Lattices</i> <i>and Positive Operators</i> (1974). The first of these was subsequently translated into Spanish and Russian. The second made him an internationally recognized and leading scholar in this particular field of mathematics. (Roquette & Wolff, 2006) </p>