Differences between if only and only if
Posted: Sat May 05, 2012 12:21 am
A, only if B-B is necessary for A.
But what does "A if only B" mean? Thanks!
But what does "A if only B" mean? Thanks!
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Re: Differences between if only and only if
Posted: Sat May 05, 2012 12:22 am
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Re: Differences between if only and only if
Posted: Sat May 05, 2012 12:47 am
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!
Re: Differences between if only and only if
Posted: Sat May 05, 2012 12:49 am
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!
Re: Differences between if only and only if
Posted: Sat May 05, 2012 1:08 am
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.
Re: Differences between if only and only if
Posted: Sat May 05, 2012 1:11 am
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
Re: Differences between if only and only if
Posted: Mon May 07, 2012 3:56 pm
