Элементы дискретной математики. Часть I - 15 стр.

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Γ
[Γ] = P
2
Γ
x
1
&x
2
¯x
1
¯x
2
x
1
x
2
¯x
1
x
2
{¯x, &, ∨}, {¯x, &}, {¯x, ∨}.
¯x x|x |
x
1
x
2
(x
1
|x
1
)|(x
2
|x
2
)
x
1
&x
2
x
1
x
2
¯x x 1
{0, 1,x
1
x
2
,x
1
x
2
}.
n
Σ
t=1
Σ
1i
1
<i
2
<...<i
t
n
a
i
1
,i
2
,...,i
t
x
i
1
x
i
2
...x
i
t
a,
a
i
1
,i
2
,...,i
t
a
fg = gf, f g = g f, f(g h)=fg fh, ff = f,
{0, 1,x
1
x
2
,x
1
x
2
}
n
Σ
t=1
Σ
1i
1
<i
2
<...<i
t
n
a
i
1
,i
2
,...,i
t
x
i
1
x
i
2
...x
i
t
a,