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・ Theodor Schieffer
・ Theodor Schjøth
・ Theodor Schneider
・ Theodor Schwann
・ Theodor Schwenk
・ Theodor Schönemann
・ Theodor Seibert
・ Theodor Seitz
・ Theodor Sele
・ Theodor Seliwanoff
・ Theodor Siebs
・ Theodor Simon Flatau
・ Theodor Sockl
・ Theodor Sparkuhl
・ Theodor Speranția
Theodor Spieker
・ Theodor Sproll
・ Theodor Stang
・ Theodor Steltzer
・ Theodor Sternberg
・ Theodor Stolojan
・ Theodor Storm
・ Theodor Strünck
・ Theodor Svedberg
・ Theodor Szehinskyj
・ Theodor Szántó
・ Theodor Thierfelder
・ Theodor Thjøtta
・ Theodor Thomsen
・ Theodor Tirkkonen


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Theodor Spieker : ウィキペディア英語版
Theodor Spieker
Theodor Spieker (1823–1913) was a German mathematician, a teacher at a gymnasium in Potsdam.〔.〕
Spieker's geometry textbook ''Lehrbuch der ebenen Geometrie mit Übungs-Aufgaben für höhere Lehranstalten'' (Verlag von August Stein, Potsdam, 1862)〔(Worldcat entry ) for ''Lehrbuch der ebenen Geometrie'', accessed 2012-05-05.〕〔(''Lehrbuch der ebenen Geometrie mit Übungs-Aufgaben für höhere Lehranstalten'' ) (1898 ed.) on Google Books, accessed 2012-05-05.〕 was republished in many editions. A copy of this textbook was given to Albert Einstein by his tutor when Einstein was twelve, and quickly led Einstein to become interested in higher mathematics.〔.〕
Spieker is the namesake of the Spieker circle of a triangle (the circle inscribed in its medial triangle) and the Spieker center (the center of the Spieker circle).
==References==



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