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- Исаак Азимов
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- Конец вечности
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- Стр. 149/248
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"
For
instance
,
suppose
a
Change
here
in
the
575th
.
Reality
will
change
with
increasing
effects
to
perhaps
the
600th
.
It
will
change
,
but
with
continually
lesser
effects
to
perhaps
the
650th
.
Thereafter
,
Reality
will
be
unchanged
.
We
all
know
this
is
so
,
but
do
any
of
us
know
why
it
is
so
?
Intuitive
reasoning
would
suggest
that
any
Reality
Change
would
increase
its
effects
without
limit
as
the
Centuries
pass
,
yet
that
is
not
so
.
"
Take
another
point
.
Technician
Harlan
,
I
’
m
told
,
is
excellent
at
selecting
the
exact
Minimum
Change
Required
for
any
situation
.
I
’
ll
wager
he
cannot
explain
how
he
arrives
at
his
own
choice
.
"
Consider
how
helpless
the
Primitives
must
be
.
They
worry
about
a
man
killing
his
own
grandfather
because
they
do
not
understand
the
truth
about
Reality
.
Take
a
more
likely
and
a
more
easily
analyzed
case
and
let
’
s
consider
the
man
who
in
his
travels
through
time
meets
himself
-
-
"
Harlan
said
sharply
,
"
What
about
a
man
who
meets
himself
?
"
The
fact
that
Harlan
interrupted
a
Computer
was
a
breach
of
manners
in
itself
.
His
tone
of
voice
worsened
the
breach
to
a
scandalous
extent
,
and
all
eyes
turned
reproachfully
on
the
Technician
.
Sennor
harumphed
,
but
spoke
in
the
strained
tone
of
one
determined
to
be
polite
despite
nearly
insuperable
difficulties
.
He
said
,
continuing
his
broken
sentence
and
thus
avoiding
the
appearance
of
answering
directly
the
unmannerly
question
addressed
to
him
,
"
And
the
four
subdivisions
into
which
such
an
act
can
fall
.
Call
the
man
earlier
in
physiotime
,
A
,
and
the
one
later
,
B
.
Subdivision
one
,
A
and
B
may
not
see
one
another
,
or
do
anything
that
will
significantly
affect
one
another
.
In
that
case
,
they
have
not
really
met
and
we
may
dismiss
this
case
as
trivial
.
"
Or
B
,
the
later
individual
,
may
see
A
while
A
does
not
see
B
.
Here
,
too
,
no
serious
consequences
need
be
expected
.
B
,
seeing
A
,
sees
him
in
a
position
and
engaged
in
activity
of
which
he
already
has
knowledge
.
Nothing
new
is
involved
.
"
The
third
and
fourth
possibilities
are
that
A
sees
B
,
while
B
does
not
see
A
,
and
that
A
and
B
see
one
another
.
In
each
possibility
,
the
serious
point
is
that
A
has
seen
B
;
the
man
at
an
earlier
stage
in
his
physiological
existence
sees
himself
at
a
later
stage
.
Observe
that
he
has
learned
he
will
be
alive
at
the
apparent
age
of
B
.
He
knows
he
will
live
long
enough
to
perform
the
action
he
has
witnessed
.
Now
a
man
in
knowing
his
own
future
in
even
the
slightest
detail
can
act
on
that
knowledge
and
therefore
changes
his
future
.
It
follows
that
Reality
must
be
changed
to
the
extent
of
not
allowing
A
and
B
to
meet
or
,
at
the
very
least
,
of
preventing
A
from
seeing
B
.
Then
,
since
nothing
in
a
Reality
made
un
-
Real
can
be
detected
,
A
never
has
met
B
.
Similarly
,
in
every
apparent
paradox
of
Time
-
travel
,
Reality
always
changes
to
avoid
the
paradox
and
we
come
to
the
conclusion
that
there
are
no
paradoxes
in
Time
-
travel
and
that
there
can
be
none
.
"
Sennor
looked
well
pleased
with
himself
and
his
exposition
,
but
Twis
sell
rose
to
his
feet
.
