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Question

Mathematics Question on Relations and functions

Which of the following relation is NOT a function

A

f = {(x,x)∣x∈R(x, x) | x \in R }

B

g = {(x,3)∣x∈R(x, 3) | x \in R}

C

h = (n,1n)∣n∈I{\left(n, \frac{1}{n}\right) | n \in I}

D

t = {(n,n2)∣n∈N(n, n^2) | n \in N}

Answer

h = (n,1n)∣n∈I{\left(n, \frac{1}{n}\right) | n \in I}

Explanation

Solution

If n = 0, then h (n) is not defined, so, ???