What does Y mean in mathematics?
Representing an unknown number (variable) in an equation of one variable
Represents an unknown (variable) associated with another unknown (variable) in a binary equation
The representative meaning of ∑ in Mathematics
n
∑a(i)
i=1
Denotes a (1) + a (2) +... + a (n)
I = 1 means starting from a (1)
A (n) means to the end
In mathematics! And √ respectively mean?
! Full Permutation