Mathematics
Consider the relations π
1 and π
2 defined as ππ
1π β π2 + π2 = 1 for all π, π β R and (π, π)π
2(π, π) β π + π = π + π for all (π, π), (π, π) β N Γ N. Then
A
π
1 and π
2 both are equivalence relations
B
Only π
1 is an equivalence relation
C
Only π
2 is an equivalence relation
D
Neither π
1 nor π
2 is an equivalence relation
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