I've come across an expression from the Stanford Neural Network Course Note that looks like this:
c are parameter vectors)
What is the name of this notation "𝟙" and what does it mean / do? i.e.
I guess it means "1" (one) but not entirely sure as it seems to be written in a specific way for a reason? (could it be that it means
x is within the range
x is outside that range? Boolean related?)