about the relation R={ (n,m)∈ N×N: ∃r ∈ N: n^2 + m^2 = r^2}
N is set of natural number.
a)how to show the converse of R is equal to R?
b)how to prove R is not the empty relation?
c)how to prove R is not a function?
about the relation R={ (n,m)∈ N×N: ∃r ∈ N: n^2 + m^2 = r^2}
N is set of natural number.
a)how to show the converse of R is equal to R?
b)how to prove R is not the empty relation?
c)how to prove R is not a function?