What is the Demorep1 'clone' idea?
Craig Carey
research at ijs.co.nz
Mon Mar 13 00:49:09 PST 2000
At 17:42 13.03.00, DEMOREP1 at aol.com wrote:
>research at ijs.co.nz asked-
>
>I ask Demorep1 to define as briefly and a mathematically as he can,
> his idea of "clones". I guess it differs from Blake Cretney's,
...
>D- A clone is an added choice that is ... beaten by another like choice
>(such as 2 or more like liberals or conservatives).
...
>In reality land, adding a clone may cause some voters to put the clone before
>the original.
>
>32 ABNC
>3 ANBC
>30 BNCA
>4 NBCA
>29 CABN
>2 CANB
>100
>
>91 BN 9 (margin 82)
>Note that N still beats C.
...
Possibly Demorep1 gave consideration to writing:
"if B loses then N loses also".
Rule P1 allows that to be deduced. Recap.: P1 is that rule that says that,
for a candidate, if preferences at and after a preference for that
candidate are altered in any way, then the candidate cannot change
from a loser into a winner. (In papers where the candidate's preference
is the first, then votes, rather than preferences, may be discarded.)
Depending on how monotonicity is defined, the following argument could be
made with monotonicity instead of P1 (monotonicity is presumably weaker).
Assume N wins system (10).
(10):
32 ABN
3 ANB
30 BNC
4 NBC
29 CAB
2 CAN
By P1, if B loses (10), then B also loses (11). [B weakens its vote.]
Equivalently (since (a=>b)=((-a)=>(-b))).
If B wins (11), then B wins (10).
(11):
3 ABN | 31
29 ANB |
3 ANB
4 BNC | 30
26 NBC |
4 NBC
2 CAB | 29
27 CAN |
2 CAN
Papers (11) are identical to (12). If B wins (12) then B wins (10).
(12):
3 ABN
32 ANB
4 BNC
30 NBC
2 CAB
29 CAN
Swap B with N in (12) and that converts (12) into (10). The statement
then becomes: If N wins (10) then B wins (10).
Hence it is seen that it can never occur that N loses (10) and
B wins (10). That holds for the number of winners being between
0 and 4.
I ask Demorep1: what is your idea of clones? if it is nothing but a
corollary of monotonicity?. I presume it is just that. Some methods
are not monotonic.
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