The phrase "about what sets" is correct and usable in written English.
It can be used when discussing the characteristics or factors that distinguish something from others.
Example: "In this presentation, we will talk about what sets our product apart from the competition."
Alternatives: "regarding what distinguishes" or "concerning what differentiates".
Indeed, Frege was clearer than Cantor about what sets and their elements actually were.
Public reason liberals disagree about what sets of information interfere with impartiality, but all theorists subtract misinformation and biasing information.
The chairman of ING Direct USA talks with Steve Forbes about what sets his bank apart, the perils of online security and how to fix mortgages in America.
Rive spoke with Forbes Technology Editor Kerry Dolan about what sets SolarCity apart, what is fueling its growth, and why solar sometimes doesn't make sense.
But co-founders Shahzad Younas and Ryan Brodie are clear about what sets their target audience apart from the casual dating/hook-up crowd: a genuine intent to find a partner in order to get married.
We brought Hawkins by TechCrunch TV to give us a hands-on look at Swirl It and talk about what sets it apart from other apps for the oenophile set.
There has been much speculation about what set Exogenous off that day.
Next week, Chris Suellentrop will write about what set him on the path toward becoming a video games critic for The Times.
Next week, Holland Cotter will write about what set him on the path toward becoming an art critic for The Times.
Next week, Ben Ratliff will write about what set him on the path toward becoming a pop and jazz critic for The Times.
The observations may also provide a new measure of how fast the universe is expanding as a legacy of the Big Bang explosion, and say something about what set off the explosion in the first place.
