calculations and investigations more reliable and productive. One of

my pet hates is articles that attempt to define some brilliant new

notation but just present definitions without actually giving any

examples of calculations. Obviously I recognise page limits and

annoying editors, but this

article doesn't do more than define things, without showing how

they can be useful. (Institutional subscription cookie might be required.)

[Update: the article is actually one of a

*long*series, with the latter half actually doing some very interesting calculations in the diagram notation.]

In contrast, Predrag

Cvitanovic's book on Group Theory (which I'm still slowly working

through in off hours) does actually demonstrate some calculations. I

still can't help wondering why this is so rare though.