====== Differential Geometry ====== * [[https://arxiv.org/abs/1709.08492#|A pictorial introduction to differential geometry, leading to Maxwell's equations as three pictures]] by Jonathan Gratus * [[http://davinci.fmph.uniba.sk/~fecko1/referaty/regensburg_2007.pdf|Differential Geometry in Physics An introductory exposition for true non-experts]] by Marián Fecko * Differential Geometry and Lie Groups for Physicists by Marián Fecko * [[https://web.archive.org/web/20180127144926/http://www.math.cornell.edu/~sjamaar/manifolds/|Manifolds and Differential Forms]] lecture notes by Reyer Sjamaar The motto in this section is: //the higher the level of abstraction, the better//.