math 3 16
2
-1
i
2
=
-1
0
0
0
/
0
=
NaN
P
true
∨
P
=
true
P
false
∧
P
=
false
Z
≠
∅
22
7
π
≃
22
/
7
0.5772156649
γ
≃
0.5772156649
∞