A, only if B-B is necessary for A.
But what does "A if only B" mean? Thanks!
Differences between if only and only if Forum
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kaiser
- Posts: 3019
- Joined: Mon May 09, 2011 11:34 pm
Re: Differences between if only and only if
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Last edited by kaiser on Sat May 05, 2012 1:11 am, edited 1 time in total.
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Br3v
- Posts: 4290
- Joined: Mon Jun 13, 2011 7:18 pm
Re: Differences between if only and only if
Short hand is you kind of flip your arrow around.
Normal if:
A if B
B > A
I will be tired if I run a marathon
If I run a marathon > I will be tired
Only if:
A only if B
A > B
I will be tired only if I run a marathon
If I am tired > then I ran a marathon
We know this because that's the only way you'd be tired!
Normal if:
A if B
B > A
I will be tired if I run a marathon
If I run a marathon > I will be tired
Only if:
A only if B
A > B
I will be tired only if I run a marathon
If I am tired > then I ran a marathon
We know this because that's the only way you'd be tired!
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kaiser
- Posts: 3019
- Joined: Mon May 09, 2011 11:34 pm
Re: Differences between if only and only if
His question was about the phrasing "if only" (as in "A if only B"), which is certainly odd, and I can't recall ever seeing it used on the LSAT.Br3v wrote:Short hand is you kind of flip your arrow around.
Normal if:
A if B
B > A
I will be tired if I run a marathon
If I run a marathon > I will be tired
Only if:
A only if B
A > B
I will be tired only if I run a marathon
If I am tired > then I ran a marathon
We know this because that's the only way you'd be tired!
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timmydoeslsat
- Posts: 148
- Joined: Wed Aug 03, 2011 2:07 pm
Re: Differences between if only and only if
The phrase "if only" is a sufficient condition.
If only I had enough money, I would go to the beach.
Enough money ---> Beach
Only if = necessary.
If only = sufficient. No different than regular if.
If only I had enough money, I would go to the beach.
Enough money ---> Beach
Only if = necessary.
If only = sufficient. No different than regular if.
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kaiser
- Posts: 3019
- Joined: Mon May 09, 2011 11:34 pm
Re: Differences between if only and only if
timmydoeslsat wrote:The phrase "if only" is a sufficient condition.
If only I had enough money, I would go to the beach.
Enough money ---> Beach
Only if = necessary.
If only = sufficient. No different than regular if.
After thinking it over, I think this is correct, and my initial intuition was wrong. OP, disregard my earlier post
