Dirac, Quantum, Quantum Physics, Study, Learning.
bra written as a backward ket. https://www.youtube.com/watch?v=lRR-qgjaKlg Remember this is a linear functional so it should be seen as an operator that acts on a ket and returns a possibly complex number. https://www.youtube.com/watch?v=lRR-qgjaKlg These bras live in the Hilbert dual space(as