A Concordance Analogue of the 4D Light Bulb Theorem
Sign Up to like & getrecommendations! Published in 2019 at "International Mathematics Research Notices"
DOI: 10.1093/imrn/rnz202
Abstract: We prove a concordance analogue of Gabai’s $4$D light bulb theorem. That is, we show that when $R$ and $R^{\prime}$ are homotopic, embedded $2$-spheres in a $4$-manifold $X^4,$ where $\pi _1(X^4)$ has no $2$-torsion and… read more here.
Keywords: bulb theorem; concordance analogue; light bulb;
"A Light Bulb in Every House": The Istanbul General Electric Factory and American Technology Transfer to Turkey
Sign Up to like & getrecommendations! Published in 2022 at "Technology and Culture"
DOI: 10.1353/tech.2022.0108
Abstract: abstract:In 1946, Turkish entrepreneur Vehbi Koç signed an agreement with the U.S. firm General Electric to build and operate its first light bulb factory in the Near/Middle East, in Istanbul. This private joint venture introduced… read more here.
Keywords: technology; light bulb; transfer; factory ... See more keywords