## Chapter 9: Aggregating Preferences: Social Choice

• Page number:267
• Section number:9.5
• Date:2013/05/22
• Name: HReijuMihara
• Email:
• Content:The paragraph preceding Proposition 9.5.1. "Arrow's impossibility system" should read "Arrow's impossibility theorem".
• Page number:268
• Section number:9.5
• Date:2013/05/22
• Name: HReijuMihara
• Email:
• Content:Definition 9.5.2. (i) Should be "to pair up all the voters for o1 with voters for o2". (ii) Need a rewrite because the following conclusion is missing before "Further": "Then the rule weakly prefers o_2 to o_1."
• Page number:269
• Section number:9.5
• Date:2013/05/22
• Name: HReijuMihara
• Email:
• Content:Just before Definition 9.5.3. Maybe "voters vote for".
• Page number:269
• Section number:9.5
• Date:2013/05/22
• Name: HReijuMihara
• Email:
• Content:Definition 9.5.3. Need a rewrite because the following conclusion is missing before "Further": "Then the rule weakly prefers o_2 to o_1."
• Page number:270
• Section number:9.5
• Date:2013/05/22
• Name: HReijuMihara
• Email:
• Content:Definition 9.5.7. Should be "to pair up all the voters for o1 with voters for o2".

### The following errors are fixed in the second printing of the book and online PDF v1.1

• Page number: 256
• Section number: 9.2
• Date: 2009/02/06
• Name: SteveWolfman
• Email:
• Content: Definition 9.2.4, o is unbound, should be \forall o \in S,
• Page number: 265
• Section number: 9.4
• Date: 2009/02/06
• Name: SteveWolfman
• Email:
• Content: Typo, in the proof of Step 1, o \in \overbar{O} should be o \in \overbar{O'}.
• Page number: 254
• Section number:9.1.1
• Date: 2009/02/06
• Name: SteveWolfman
• Email:
• Content: Typo: "..that if there exists a candidate x such that if for all other candidates y at.." should be "..that if there exists a candidate x such that for all other candidates y at..". (It also seems strange that the rest of the paragraph talks about Condorcet "ruling out" candidates rather than establishing b as the only viable candidate, since Condorcet may "rule out" all candidates in this sense but will only ever select one candidate.)
-- KevinLeytonBrown - 13 Nov 2008
Topic revision: r5 - 2013-05-22 - HReijuMihara

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