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direct evidence
direct examination
direct fire
direct flight
Direct Inward Dialing
direct loan
direct mail
direct mailer
direct mapped cache
direct marketing
Direct Memory Access
Direct nomination
direct object
Direct primary
Direct process
direct quotation
-- direct sum --
direct support
direct supporting fire
direct tax
direct tide
direct transmission
direct trust
Direct vision
Direct-Access Storage Device
Direct-acting
Direct-acting steam engine
Direct-acting steam pump
direct-action steam engine
direct-action steam pump
Direct-coupled
Direct-coupled antenna
direct-grant school
direct sum
Noun
1.
direct sum
-
a
union
of
two
disjoint
sets
in
which
every
element
is
the
sum
of
an
element
from
each
of
the
disjoint
sets
join
,
sum
,
union
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