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5.3 T
_{X}
and T
_{X}
(M)
Up:
5. Examples
Previous:
5.1 Ext modules Ext(M,R)
5.2
Hom
_{R}
(
M
,
N
)
Let
M
be given as
R
^{m}
/
Im
(
A
_{0}
),
N
as
R
^{p}
/
Im
(
B
_{0}
), where
together with free resolutions
and
We get the following commutative diagram with exact columns and rows:
.
Algorithm 5..2
is a free module modulo the image of the matrix

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