#germanculture

Today is the 124th #birthday of #German #mathematician Karl August Reinhardt (1895-1941) who(for all I know) was the first human being to describe a transitive convex pentagonal #tiling(despite #tilings having been known in several cultures since time immemorial,..

Today is the 124th #birthday of #German #mathematician Karl August Reinhardt (1895-1941) who(for all I know) was the first human being to describe a transitive convex pentagonal #tiling(despite #tilings having been known in several cultures since time immemorial,..

.. it seems to no one had found (or even looked for) for such tilings. (Here, 'convex pentagonal' means that the #polygon tiling the plane is a convex pentagon; 'transitive' means that the symmetry group of the tiling acts transitively on the set of tiles.)

Reinhard found five..

Reinhard found five..

..distinct TYPES of such tilings. I did not read his work sufficiently closely to be able to tell whether Reinhardt claimed to have found ALL. Anyways, it took 50 years till more types were found(by the #American Kershner in 1968 who found three more types). The search for more..

#germanculture

Today is the 157th #birthday of #German #mathematician Friedrich Engel (1861-1941). Engel is remembered for several achievements. He edited the works of ingenious, though outwardly unsuccessful and underestimated, German mathematician Hermann Graßmann, he was..

Today is the 157th #birthday of #German #mathematician Friedrich Engel (1861-1941). Engel is remembered for several achievements. He edited the works of ingenious, though outwardly unsuccessful and underestimated, German mathematician Hermann Graßmann, he was..

.. president of the 'Deutsche Mathematiker-Vereinigung' in 1910. He did much work on #LieAlgebras (the theorists of which commemorate Engel by naming a characterization of nilpotent Lie algebras after him). Engel is said to have had a talent for learning foreign languages, and..

.. his well-meaning efforts to act as an intermediary and popularizer with regard to the original work of the #Norwegian mathematician Sophus Lie (1842-1899) caused him an usual embarassment: Lie bitterly accused Engel not of #plagiarism but of having acted as a #spy who had ..

#germanhistory

136 years ago today, #German #mathematician Felix Klein(1849-1925), then professor at #Leipzig University, wrote an interesting letter to his colleague Adolph Mayer(1839-1908), a letter which betrays Klein's indulgence towards the controversial theory of Cantor:..

136 years ago today, #German #mathematician Felix Klein(1849-1925), then professor at #Leipzig University, wrote an interesting letter to his colleague Adolph Mayer(1839-1908), a letter which betrays Klein's indulgence towards the controversial theory of Cantor:..

.. » Leipzig, 15. 12. 1882 \\ Lieber Freund! \\ Vorgestern Nachmittag war Cantor lange hier und brachte mir eine Arbeit für die Annalen (Ueber ∞ lineare Punctmannigfaltigkeiten V) von merkwürdig speculativem Inhalt, von der er aus allerlei Gründen wünscht, dass sie recht bald..

.. publicirt werde. Ich habe ihm angeboten, dass wir die Separatabzüge umgehend herstellen, die officielle Publication aber bis zu geeigneter Zeit verschieben, und will nun, in der Voraussetzung, dass Ihnen die Sache so recht ist, heute Nachmittag in die Druckerei gehen und..

Hello, I am Edna Matta. I was born in #Ibague, known as #Colombia’s #CityofMusic. A beautiful place near snow-covered volcanos (Ruiz, Santa Isabel and Tolima), large expanses of paramo forest, lakes and streams where a diverse array of animal and plant species coexist

My story starts with #powerful, #strong #women in my #family. I was the third of 4 children and my mom #firstMentor had to raise us practically alone, since my father had to work in a different city, 20h away by car

My mom is a very #strong #woman that taught me #values, to #workhard and to be #self-sufficient #StrongWomen #StrongFamily

@IWS_Network #VoicesIWS /1

@IWS_Network #VoicesIWS /1

#germanculture

Today is the 124-th #birthday of #German #mathematician Heinz Hopf(1894-1971). By ISBN 3-05-500402-7,page 173, Hopf in 1925 became one of only ten men during the 124 years from 1810-1933 whom the #mathematics faculty of #Berlin gave the grade of 'summa cum laude'..

Today is the 124-th #birthday of #German #mathematician Heinz Hopf(1894-1971). By ISBN 3-05-500402-7,page 173, Hopf in 1925 became one of only ten men during the 124 years from 1810-1933 whom the #mathematics faculty of #Berlin gave the grade of 'summa cum laude'..

.. for his doctorate. Hopf's relatively old graduation age of 28.5 years (which is old in mathematics, esp. in Hopf's time) is clearly due to #WorldWarOne: at age 18, Hopf volunteered to serve in the #German army, which he did(as a low-ranking officer) for a full four years..

#germanhistory,#historyofmathematics 146 years ago today, the important #German #mathematician Alfred Clebsch (1833-1872)died suddenly of an infection with the 'Klebs-Löffler bacillus'(aka 𝘊𝘰𝘳𝘺𝘯𝘦𝘣𝘢𝘤𝘵𝘦𝘳𝘪𝘶𝘮 𝘥𝘪𝘱𝘩𝘵𝘩𝘦𝘳𝘪𝘢𝘦). In 1872, this #bacterium had not..

.. yet been 'discovered' (the offiicial date for its discovery/description is 1884). The similarity of the names 'Clebsch' and 'Klebs' is coincidental, yet a good #mnemonic. Clebsch familiarized the German mathematical scene with the work of Cayley and Sylvester, and also made..

.. new and fruitful connections between their and Riemann's work. Clebsch collaborated closely with the German-Jewish mathematician Paul Gordan (doctoral advisor of Emmy Noether). Today, this collaboration is remembered mostly by way of the term 'Clebsch-Gordan coefficients '.