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标题: SDCAR2010【逻辑入门】（十五）More on Negation [打印本页]
作者: sdcar2010 时间: 2011-8-17 10:48
标题: SDCAR2010【逻辑入门】（十五）More on Negation
Necessary assumption. Usenegation. I said these two sentences hundreds of times here. If you master thetechnique of negation, you should be able to solve the necessary assumptionproblems easily and pass GMAT with flying colors.
When you negate an answer, just negate it. Try not to turn it into itsopposite. Also, negate either the verb or the quantity, but not both.
To negate an if-thenstatement, negate ONLY the then clause.So "if A, then B" would become "if A, then not B"
Quantitites | Negation
all, any,each, every, always | not all, some arenot
most,majority | not most
usually,likely | not usually, not likely
some,many, few | none
sometimes,often, rarely | never
only one,only once | more than one, none (That's right. Not one = none or more thanone)
exactlytwo | one, more than two,none (similar to the reason listed above)
no, none | some
Verbs | Negation
作者: AlohaDJ 时间: 2011-8-17 19:01
Thanks for the new chapter. Really leartned a lot from the series. Thanks a lot!
Anything new for future?
作者: daisyの小夢想 时间: 2011-8-18 15:30
Cool ~ 终于更新了。支持。
作者: mia113 时间: 2011-8-19 10:10
really helpful~!!!
作者: mia113 时间: 2011-8-19 10:16
I'm quite confused about the 'most, majority | not most'
In your previous post, you've mentioned that most meant more than half or all.
is that 'not most' means "less than half or none"?
Hope you can answer my question, thanks in advance.
作者: sdcar2010 时间: 2011-8-19 10:36
I'm quite confused about the 'most, majority | not most'
In your previous post, you've mentioned that most meant more than half or all.
is that 'not most' means "less than half or none"?
Hope you can answer my question, thanks in advance.
-- by 会员 mia113 (2011/8/19 10:16:52)
Yes, your understanding is correct.
作者: sandychen168 时间: 2011-8-22 23:07
大人，膜拜你啊~~~~期待下文，您太伟大了！！！！！！！！！！！
作者: sandychen168 时间: 2011-9-1 17:15
dear SDCAR~
I'm rather confused by this negation
Verbs | Negation
will | might, might not (Another case of paradox!)
Why the negtion of "will" is "might" and "might not" but not "will not".
Thank you!!!
作者: happybeibei 时间: 2011-9-4 11:36
亲爱的楼主~~还有更新么？！
作者: sdcar2010 时间: 2011-9-4 11:56
Here, we are talking about logical opposite vs. polar opposite. Will not is the polar opposite of will. "Will" mean definitely YES and inevitably YES! "Will not" means defintely NO and inevitably NO. However, in CR we are talking about LOGICAL opposite. Might and Might not means NOT definitely YES, not certain.
dear SDCAR~
I'm rather confused by this negation
Verbs | Negation
will | might, might not (Another case of paradox!)
Why the negtion of "will" is "might" and "might not" but not "will not".
Thank you!!!
-- by 会员 sandychen168 (2011/9/1 17:15:29)
作者: sdcar2010 时间: 2011-9-4 11:58
亲爱的楼主~~还有更新么？！
-- by 会员 happybeibei (2011/9/4 11:36:17)
I am at my wits' end. What else do you want to learn?
作者: sandychen168 时间: 2011-9-8 07:54
Here, we are talking about logical opposite vs. polar opposite. Will not is the polar opposite of will. "Will" mean definitely YES and inevitably YES! "Will not" means defintely NO and inevitably NO. However, in CR we are talking about LOGICAL opposite. Might and Might not means NOT definitely YES, not certain.
dear SDCAR~
I'm rather confused by this negation
Verbs | Negation
will | might, might not (Another case of paradox!)
Why the negtion of "will" is "might" and "might not" but not "will not".
Thank you!!!
-- by 会员 sandychen168 (2011/9/1 17:15:29)
-- by 会员 sdcar2010 (2011/9/4 11:56:49)
Thank you!!!!
作者: caoqin1981 时间: 2011-9-14 08:40
否的范围和度好像很难把握嘛
作者: lq0 时间: 2011-10-7 15:55
then why boht "if" and "then" clauses have to be negated in contrapositive? contrapositive means we have to negate as well as switch. in both cases, we have to negate.
help~~~~~~~~~~~~~~~~~~
作者: sdcar2010 时间: 2011-10-7 20:29
In contrapositive, we want to find a CORRECT statement if the original statement is correct.
In negation for necessary assumption question, we want to find a statement which, when negated, would NOT lead to the orignial conclusion in the end.
then why boht "if" and "then" clauses have to be negated in contrapositive? contrapositive means we have to negate as well as switch. in both cases, we have to negate.
help~~~~~~~~~~~~~~~~~~
-- by 会员 lq0 (2011/10/7 15:55:44)
作者: bonfin 时间: 2011-10-31 12:38
quantity negation
100 0~99
1~100 0
作者: nobody910 时间: 2012-2-5 10:47
标题: 求教否命题和命题的否定
请问SDCAR，negation（logical opposite）是不是就是说命题的否定。而polar opposite则是指完全相反，相当于取补集。
negation与polar opposite的关系跟 命题的否定和否命题的关系 是两回事吧？
THX!
Here, we are talking about logical opposite vs. polar opposite. Will not is the polar opposite of will. "Will" mean definitely YES and inevitably YES! "Will not" means defintely NO and inevitably NO. However, in CR we are talking about LOGICAL opposite. Might and Might not means NOT definitely YES, not certain.
dear SDCAR~
I'm rather confused by this negation
Verbs | Negation
will | might, might not (Another case of paradox!)
Why the negtion of "will" is "might" and "might not" but not "will not".
Thank you!!!
-- by 会员 sandychen168 (2011/9/1 17:15:29)
-- by 会员 sdcar2010 (2011/9/4 11:56:49)
作者: sdcar2010 时间: 2012-2-5 13:19
Negation 相当于取补集 or anything BUT (the original statement).
Polar opposite is COMPLETE opposite of (the original statement).
作者: 812966141 时间: 2012-4-17 19:54
先顶再看
作者: 晓野的野 时间: 2013-3-26 01:00
赞赞赞 有时候取非不知道取哪个 这样一看清楚多了！
作者: wjtwenzi 时间: 2013-8-13 20:24
sdcar2010 发表于 2012-2-5 13:19 
Negation 相当于取补集 or anything BUT (the original statement).Polar opposite is COMPLETE opposite o ...
GOT IT！Thank You!
作者: 醒醒Shine 时间: 2014-4-2 16:41
thx so much！！
作者: zhangyanlele 时间: 2014-4-9 22:56
实在是太精炼啦！谢谢！！！
作者: InfiniteAlex 时间: 2014-9-11 19:57
cool~~~~~~~~~~~~~~~~~~~
作者: echogmj 时间: 2015-1-17 02:29
thanks for sharing ~
作者: Annasis 时间: 2015-9-17 00:15
感谢分享！
作者: sa0314 时间: 2018-6-9 13:31
Mark一下！
作者: 梦季 时间: 2018-6-12 13:09
感谢分享！
作者: winner887 时间: 2018-7-20 15:05
THX
作者: 我爱吃香菜 时间: 2020-7-24 20:00
感谢分享！
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