. .
() , . . . . , . . p/q, q , , .
, . 0, 1, , , , , 1 - , .
2. . . .
, N={n}
: ) (N) = {1; 2; 3;...; n;... }; ) (Q) = {m/n m Z, n N}; ) (Z) = {; 1; 2;...; n;... }; )
. 0 0 .
0 - £ 0 0 + £
£ (0) = (0 - £;0 + £)
3.
. .
: 1) : , ={1,2,4}, B={3,4,5,2}, ∩ = {2,4} 2) : , ={1,2,4}, B={3,4,5,6}, ∪ B = {1,2,3,4,5,6}
3) (): , ={1,2,3,4}, B={3,4,5}, = {1,2}4) : 4) , ={1,2,3,4}, B={3,4,5,6}, Δ = {1,2} ∪ {5,6} = {1,2,5,6}
4. , ; . y = sin x.
f Y, Y Y=f(x) (x ϵ X).
Y Ҩ () X, f(x)=y, X=Ҩ(y), (y ϵ Y) Y=f(x) (x ϵ X).
y=sinX
y=sinX . y=sinX, ϵ [- π/2; π/2] Ҩ () X=Ҩ(y) sin (arcsin Y0) = Y0.
5.