I am a master student in Mathematics. I got a scholarship that would pay me a 1-year stay (including housing etc.) at Harvard University. All I need to do, is to apply for admission as a Special student at the Graduate School of Arts and Sciences (and be admitted of course).
Searching through the internet, some people indicated that admission as a special student is a: if you pay, you are in-system. Is this true? Or is admission as competitive as the one for regular students in the PhD programms?