Some slides explaining covectors* from my youtube series on relativity. (1/5)
*also called "1-forms", "linear forms", "linear functionals" because one name would be too easy.
New paper about some connections between algebraic geometry, number theory, and geometric topology with @wanlinbunny, Nick Salter, and Padma Srinivasan! Surface bundles and the section conjecture: https://t.co/nMbma7aDYw
How a black hole is formed (see figure).
The 2020 #NobelPrize in Physics has been awarded with one half to Roger Penrose and the other half jointly to Reinhard Genzel and Andrea Ghez.