https://www.youtube.com/watch?v=mAZSmzv_asU&list=PLTjLwQcqQzNKzSAxJxKpmOtAriFS5wWy4
00:00 Wave function and Ket vector
03:17 Bra vector
04:35 Scalar product
05:53 Inner product
06:35 Visuals interpretation
06:49 Tensor/outer product
07:42 Projection matrix
08:39 Basis change of kets
Books by Alexander Fufaev: https://fufaev.org/#death