元となった辞書の項目
action
noun
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(mathematics)
A
mapping
from
a
pairing
of
mathematical
objects
to
one
of
them,
respecting
their
individual
structures.
The
pairing
is
typically
a
Cartesian
product
or
a
tensor
product.
The
object
that
is
not
part
of
the
output
is
said
to
act
on
the
other
object.
In
any
given
context,
action
is
used
as
an
abbreviation
for
a
more
fully
named
notion,
like
group
action
or
left
group
action.
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