#let tensor = $times.circle$
#let phi = $phi.alt$
#let jstr = $arrow(j)$
#let lstr = $arrow(l)$

#let bra(var) = $angle.l #h(.5pt) #var #h(.5pt)|$
#let ket(var) = $|#h(.5pt) #var #h(.5pt) angle.r$
#let inner(x, y) = $angle.l #x #h(.5pt)|#h(.5pt) #y angle.r$
