Lol, if that's a joke, it's pretty funny. :-) Also, sorry about being Mr. Joke Explainer below. If not, you're kinda missing the point. All mathematicians kn

Lol, if that's a joke, it's pretty funny. :-) Also, sorry about being Mr. Joke Explainer below. If not, you're kinda missing the point. All mathematicians know that this is how it works. If they did not already know it going into grad school, at some point, they will find out. That means that department-level processes all more or less take into account that this is done. That might mean that you'd need a few solo or at most 2 author papers to have a good tenure case, but nonetheless, it's accounted for. At the faculty-wide level, math departments do have to communicate this standard to faculty of other disciplines. But, OTOH, it does facilitate a joke I know: at one point, it was widely held that the three best British mathematicians alive were Hardy, Littlewood, and Hardy-Littlewood.