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not O |
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linear B-Math |
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homomorphisms O |
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basi O |
also O |
called O |
module B-Math |
homomorphisms I-Math |
are O |
defined O |
for O |
modules O |
exactly O |
as O |
for O |
vector O |
spaces O |
with O |
the O |
essential O |
difference O |
that O |
if O |
r O |
is O |
not O |
a O |
field O |
there O |
are O |
modules O |
that O |
do O |
not O |
have O |
any O |
basi O |
in O |
any O |
event O |
the O |
span O |
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