Made a video explaining the Einstein summation convention and index notation, using fluid mechanics as the example
 |
I've been building a full turbulence course on YouTube and hit the point where the algebra gets unreadable without index notation. This video is a standalone introduction to the Einstein summation convention, free vs. dummy indices, and the Kronecker delta, using the Navier-Stokes equations as the worked example throughout. Even outside fluid mechanics, if you've hit tensor notation in GR, continuum mechanics, or elsewhere and found the index-shuffling confusing, the core ideas here (especially the Kronecker delta substitution property) transfer directly. Link: https://www.youtube.com/watch?v=TdfMawfDr_0 Happy to answer questions on the notation itself, not just the fluids application. submitted by /u/SatanGoku |
