The mathematical formula in the title is actually the Möbius inversion formula - a complex number theory concept that most people won't recognize but might upvote to seem intellectually superior. Just like posting obscure equations on social media hoping for validation from your peers without anyone calling your bluff!
It's that perfect mathematical flex where you know 99% of people scrolling will think "wow, must be some genius-level stuff" and hit that upvote button while secretly thinking "I should probably know this..." Nobody wants to be the one to ask "what does this even mean?" and expose their mathematical mortality.