I know we use n for length of a vector in many cases such as in the mean formula:
Well let's say I have a list of vectors maybe:
x = \{a, b, c\}
and a = \{1, 2, 3 \}, b = \{4, 2, 3, 6 \}, c = \{14\}
I want to talk about the length of x but also about the lengths of (a, b, and...