Can someone explain to me this:
activity = min(time * 14, posts)
what is min and what is "comma" posts. I just never seen a comma in an equation so I am not sure what to make out of it.

min is a function that receives 2 parameters:
value 1 = time * 14
value 2 = posts
It then returns the lowest value.
Example:
time = 10
posts = 40
activity = min(140, 40)
activity = 40