/sci/ - Science & Math

as well as this

>>4141781
the last one was a question about how a particle moves when this is the force. I solve the equations for this undifferentiable force field.

>>3479800
for you :)

Simplify what?
It's the factorial function:
n!=1·2·3···(n-1)·n

and you are right because

if you have
2 object (ab) then you can permute the stuff in the bracket: ab<->ba

if you have 3 objects then you have
(ab)c, (a)c(b), c(ab) = 3
and you permute the stuff in the bracket, so 2·3

if you have 4 objects then you have
(abc)d, (ab)d(c), (a)d(bc), d(abc) = 4
and you permute the stuff in the bracket, so 2·3·4

and so on.

pic related, I made that for you