C Either it is necessary that you will do A or it is necessary that you will not do A 345The move from 345 to C may seem less than obvious Is this step validTo get clear about what Chiang is imaginin ID: 859401
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1 which is not and will
which is not and will
2 not be true.E2*. A nec
not be true.E2*. A nec
3 essary consequence of
essary consequence of
4 something necessary is
something necessary is
5 itself necessary.The
itself necessary.The
6 Master Argument is an
Master Argument is an
7 attempt to show that t
attempt to show that t
8 hese three claims are
hese three claims are
9 inconsistent. If they
inconsistent. If they
10 are, then if the Þrst
are, then if the Þrst
11 two are true, E3 must
two are true, E3 must
12 be false. To put this
be false. To put this
13 another way, if the Þr
another way, if the Þr
14 st two are true, then
st two are true, then
15 the negation of E3 mus
the negation of E3 mus
16 t be true. One way to
t be true. One way to
17 state the negation of
state the negation of
18 E3 is to say that, for
E3 is to say that, for
19 any action A,Either i
any action A,Either i
20 t is necessary that yo
t is necessary that yo
21 u will do A or ÑÑÑÑÑÑ
u will do A or ÑÑÑÑÑÑ
22 ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ C. Eit
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ C. Eit
23 her it is necessary th
her it is necessary th
24 at you will do A or it
at you will do A or it
25 is necessary that you
is necessary that you
26 will not do A. (3,4,5
will not do A. (3,4,5
27 )The move from 3,4,5 t
)The move from 3,4,5 t
28 o C may seem less than
o C may seem less than
29 obvious. Is this step
obvious. Is this step
30 valid? To get clear a
valid? To get clear a
31 bout what Chiang is im
bout what Chiang is im
32 agining, letÕs begin w
agining, letÕs begin w
33 ith a much more boring
ith a much more boring