And, finally, the fourth, and perhaps most important axiom, stated that it was quite indifferent if one of them had not contributed the least bit to the contents of a paper under their common name
How is it ethical to be a co-author of a paper you have “not contributed the least bit to”?
I was flummoxed when I read that, it would be considered a serious breach of ethics in the communities I know. Is that a practice (those “rules”) specific to mathematics? Or are they just not used any more?