# Found this Matt2424 thread useful, but 2 questions

#### Question

• 152
##### Found this Matt2424 thread useful, but 2 questions
« on: December 03, 2004, 10:38:37 AM »
http://www.lawschooldiscussion.org/prelaw/index.php/topic,5330.0.html

f) you are an Ape unless you are a Monkey
Matt diagrams this as ~M->A

k) no one but Apes are teachers
I have don't know how to diagram this

#### cascagrossa

• 2424
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #1 on: December 03, 2004, 10:43:30 AM »
teacher --> ape

~ape --> ~teacher

it basically just says "only apes are teachers"

#### Question

• 152
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #2 on: December 03, 2004, 10:44:47 AM »
Yeah, I don't know what I was thinking...  I got it.

But how about the f), did Matt make a mistake?

#### cascagrossa

• 2424
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #3 on: December 03, 2004, 10:46:24 AM »
nope, he did it right.  i think most people just diagram it as the contrapositive of what matt has, but they are the exact same thing.

#### qqq

##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #4 on: December 03, 2004, 10:46:41 AM »
Your statement (k) is the same as "only apes are teachers," by the way.

So keep that in mind too.  They both have the same diagrams.

f) is correct.  Not ape -> monkey (so, not monkey -> ape).

In general, A unless B means not A -> B (if A didn't occur, then B must have).  Equivalently, not B -> A (if B didn't occur, then A must have).

#### Question

• 152
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #5 on: December 03, 2004, 10:53:28 AM »
I diagrammed it in the "standard" way:  ~A->M.  Why did Matt go with the contrapositive?

#### cascagrossa

• 2424
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #6 on: December 03, 2004, 11:11:10 AM »
i think because he comes from a formal logic background, where unless is treated as "if not."  thats actually the way i was taught to diagram it too.  but it doesnt matter at all, they mean the same thing.

#### qqq

##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #7 on: December 03, 2004, 11:12:51 AM »
I guess it's good to be facile with both (equivalent) ways, as you never know which way will make an answer more transparent on the LSAT questions.

#### BIG H2001

##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #8 on: December 03, 2004, 11:22:08 AM »
Matt2424, where art thou?

#### Matthew_24_24

• 631
• Sigh
##### Re: Found this Matt2424 thread useful, but 2 questions
« Reply #9 on: December 03, 2004, 11:30:45 AM »
I'm here, stupid school...heh.