Элементы теории категорий. Ершов А.В. - 54 стр.

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i
2
(x) = 1 x. k(x 1) = a, k(1 x) = b.
k(m
0
(x)) = k(x x) = k((x 1)(1 x)) = k(x 1)k(1 x) = ab,
m
0
,
i
0
: Z[x, x
1
] Z[x, x
1
] e
0
: Z[x, x
1
]
Z, A
Alg, Z
x: i
0
(x) = x
1
, e
0
(x) = 1.
δ
0
: Z[x, x
1
]
Z
Z[x, x
1
] Z[x, x
1
]
Z[x, x
1
] τ
0
: Z Z[x, x
1
]
S, T U
Hom
Sets
(S × T, U)
'
Hom
Sets
(S, Hom
Sets
(T, U)), f 7→
e
f
e
f(s)(t) = f(s, t) f Hom
Sets
(S × T, U), s S, t T.
T F, G: Sets Sets
F (S) = S × T, G(U) = Hom
Sets
(T, U)
Hom
Sets
(F (S), U)
'
Hom
Sets
(S, G(U)).
Sets
0
× Sets Sets
S U
C, D F : C D
Y Ob(C), T 7→ Hom
D
(F (T ), Y ) C
0
Sets.
X Ob(C).
α
T
: Hom
C
(T, X) Hom
D
(F (T ), Y ), T Ob(C),