If you really want to know the actual reason the title reads &quot;new erdős paper&quot; it is this:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Erd%C5%91s_number" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Erd%C5%91s_number</a><p>obviously this is not an actual new erdos paper, but without these shenanigans everyone&#x27;s erdos number would slowly but surely increase, as first nobody new could have co-published with him (too young) and soon the same applies to his co-authors.<p>while it might have been cute back in that era, today I think it should be treated as a historical thing.