A rule to get (calculate) a number from another number.
ans.A function is a relation in which each element of the 1st set,it corresponds to one and only one element in the 2nd set.
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See the attached link, from Wikipedia about the theta function.
It is the function for which all the elements of the range of the function corresponds to exactly one element of the domain.
it is a function to where every element in the range equals exactly one element in the range, or for every x there is exactly one f(x)
The locus of a point is the set of all positions that the point can occupy where it satisfies some defining function.
# Exactly divisible by 2. # Characterized or indicated by a number exactly divisible by 2.