Hey, I'm asking this as an idiot but if we had a equation with a factorial and you had no calculator and need to solve say 54!=5x would we have a reverse factorial. Instead of 1x2x3x4...54 its 54/53...3/2/1 which would turn the equation into this 1=5x/54/53... or like 1=revfact54(5x) is there an issue mathematically about this?