Keywords: Martin Culen 1863.jpg Portrait of Martin Čulen 1823 - 1894 Slovak mathematician Picture cropped from a gallery of famous Slovaks http //kramerius nkp cz/kramerius/handle/ABA001/10842301 Výtečníci slovenskí digitized by National Library in Prague 1863 Josef Rupert Maria Přecechtěl 1821 - 1897 Lithography probably by Roland Weibezahl 1817-1871 signed on http //kramerius nkp cz/kramerius/handle/ABA001/10890056 sheet 2 of the same series bottom left PD-old Roland Weibezahl Mathematicians from Slovakia Josef Rupert Maria Přecechtěl |