## Diagramming Help: Powerscore method vs. mine?

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norcal123456

Posts: 21
Joined: Tue Jun 14, 2011 3:32 pm

### Diagramming Help: Powerscore method vs. mine?

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Last edited by norcal123456 on Mon Sep 12, 2011 5:25 pm, edited 1 time in total.

youknowryan

Posts: 181
Joined: Mon Aug 18, 2008 3:20 am

### Re: Diagramming Help: Powerscore method vs. mine?

norcal123456 wrote:How would you diagram:

Drivers with a large number of demerit points who additionally have been convicted of a serious driving-related offense should either be sentenced to jail or be forced to receive driver reeducation, since to do otherwise would be to allow a crime to go unpunished. Only if such drivers are likely to be made more responsible drivers should driver reeducation be recommended for them. Unfortunately, it is always almost impossible to make drivers with a large number of demerit points more responsible drivers.

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Powerscore suggests you to diagram with subscripts using the "either/or formula" as follows:

SJ=sentenced to jail

SJ -> RE
RE -> MR
MR
RE
So: SJ

My question is... would it also be correct to diagram the first sentence "either/or" part like this?

DP=demerit points
SO=convicted of serious offenses
SJ=sentenced to jail

DP & SO -> SJ or RE
RE -> MR
MR
RE

The correct answer was just a repeat form of "Drivers with a large number of demerit points who have been convicted of a serious driving-related offense should be sent to jail", but I just wanted to know if my method of diagramming was the "correct" or "proper" logic way to go about the first sentence containing either/or.

DO NOT diagram this problem. Read it and understand what the author is driving at... when you do, only one answer is even close to right.

suspicious android

Posts: 919
Joined: Tue Feb 09, 2010 4:54 pm

### Re: Diagramming Help: Powerscore method vs. mine?

DP & SO -> SJ or RE
RE -> MR
~MR
~RE
[modified slightly to preserve negations]

It's fine. Like the other poster pointed out, this is probably a problem you would not want to be diagramming on test day, but to get really comfortable with conditional reasoning, it's often helpful to do a little bit of overkill. Your version of the diagramming preserves some additional aspects of the stimulus compared with the version in the book. This is sometimes helpful and sometimes confusing, you'll learn as you go when you want to simplify and when you don't (you'll usually want to simplify). Your version allows you to infer:

DP & SO --> SJ

Which is a good match with the correct answer. As is shown in another thread going on, there is rarely one correct way to diagram sentences in symbolic logic. It's more of an art than a science. Now, it's a profoundly boring art, but still...