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wswartzendruber
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PostPosted: Wed Apr 25, 2012 3:34 am    Post subject: Meh, I Tried Reply with quote

http://www.wswartzendruber.name/images/exam_fail.png
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pjp
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PostPosted: Wed Apr 25, 2012 3:38 am    Post subject: Reply with quote

Pass the class?

Can't read prof's writing... was it noteworthy?
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wswartzendruber
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PostPosted: Wed Apr 25, 2012 3:46 am    Post subject: Reply with quote

Yes, I'll pass the class.
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BoneKracker
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PostPosted: Wed Apr 25, 2012 3:53 am    Post subject: Reply with quote

You should have got at least 3 points for the artwork. :lol:

http://en.wikipedia.org/wiki/Context-free_language#Nonclosure_under_intersection_and_complement
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dmitchell
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PostPosted: Wed Apr 25, 2012 3:58 am    Post subject: Reply with quote

The real question is, why did you try?
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wswartzendruber
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PostPosted: Wed Apr 25, 2012 3:59 am    Post subject: Reply with quote

For the five points I got.
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dmitchell
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PostPosted: Wed Apr 25, 2012 4:15 am    Post subject: Reply with quote

What I mean is that extrapolating from this single exam question makes me think it is a boring, stultifying class. So the real question is, why are you taking it?
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notageek
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PostPosted: Wed Apr 25, 2012 4:40 am    Post subject: Reply with quote

Because he couldn't find any 90s wide screen TV shows. Got bored and tried to alleviate boredom by taking a test.
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Clad in Sky
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PostPosted: Wed Apr 25, 2012 5:12 am    Post subject: Reply with quote

Because sometimes when studying, you NEED to take certain classes even if you don't like it? At least in Germany that is the case.
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wswartzendruber
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PostPosted: Wed Apr 25, 2012 5:38 am    Post subject: Reply with quote

dmitchell wrote:
What I mean is that extrapolating from this single exam question makes me think it is a boring, stultifying class. So the real question is, why are you taking it?

Because it's a requirement for a computer science degree.
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PostPosted: Wed Apr 25, 2012 6:16 am    Post subject: Reply with quote

Good luck.
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Akkara
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PostPosted: Wed Apr 25, 2012 7:48 am    Post subject: Reply with quote

Spoiler (highlight with mouse to see):
Quote:
L1 == A^n1 B^n1 C^n2 == languages with a string of A's followed by the same number of B's as there are A's, followed by any number of C's

L2 == A^n1 B^n2 C^n2 == languages with some number of A's followed by a string of B's, followed by the same number of C's as thre are B's

For a string to be both in L1 and also in L2, it needs an equal number of A's, B's, and C's. A triple match on a stringlength count is not context-free. QED.


Edit: Er, ignore me. Just noticed the previously-linked wikipedia page has this exact same example.
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PostPosted: Wed Apr 25, 2012 8:37 am    Post subject: Reply with quote

Akkara wrote:
Er, ignore me.

Is this meant context-free ? :twisted:

8O context-free language 8O ... well... I would have failed answering... :oops:

And when I read BK's link... 8O mentioning a context-free grammar... I was left even more 8O 8O
What is a grammar ? I mean apart from a set of rules dedicated to put things into context ?

OK then, in French, we use algébrique instead of context-free.
And, for me, a langage algébrique engendré par une grammaire algébrique makes far more sense than a context-free language generated by a context-free grammar.

Could'nt you have used algebraic language / algebraic grammar ?
IS there some subtlety I am missing somewhere, a reminiscence of some Chomsky / Schützenberger divergence ?

EDIT : OK, after browsing the other wikipedia languages, it seems we have the only one not naming this context-free.
Yet another cultural exception :P

OK then... :

Er, ignore this here and now. :lol:
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PostPosted: Wed Apr 25, 2012 6:06 pm    Post subject: Reply with quote

France. They have mimes.
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energyman76b
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PostPosted: Wed Apr 25, 2012 6:31 pm    Post subject: Reply with quote

wswartzendruber wrote:
dmitchell wrote:
What I mean is that extrapolating from this single exam question makes me think it is a boring, stultifying class. So the real question is, why are you taking it?

Because it's a requirement for a computer science degree.


shouldn't you talk about Rings( http://en.wikipedia.org/wiki/Ring_(mathematics)), B-Trees or something like that? Maybe prolog?
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Mardok45
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PostPosted: Wed Apr 25, 2012 9:37 pm    Post subject: Reply with quote

Ah, Theory of Computation, how could I hate life with you?

Do you have to take an advanced course after this?
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pjp
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PostPosted: Wed Apr 25, 2012 11:18 pm    Post subject: Reply with quote

wswartzendruber wrote:
Yes, I'll pass the class.
That's what matters, unless it's a foundational class.
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wswartzendruber
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PostPosted: Wed Apr 25, 2012 11:54 pm    Post subject: Reply with quote

Mardok45 wrote:
Ah, Theory of Computation, how could I hate life with you?

Do you have to take an advanced course after this?

Only if I wanted a master's degree.
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BoneKracker
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PostPosted: Thu Apr 26, 2012 12:07 am    Post subject: Reply with quote

wswartzendruber wrote:
Mardok45 wrote:
Ah, Theory of Computation, how could I hate life with you?

Do you have to take an advanced course after this?

Only if I wanted a master's degree.

I guess we can rule that out, eh? :P

(Just kidding.)
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wswartzendruber
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PostPosted: Thu Apr 26, 2012 12:15 am    Post subject: Reply with quote

BoneKracker wrote:
wswartzendruber wrote:
Mardok45 wrote:
Ah, Theory of Computation, how could I hate life with you?

Do you have to take an advanced course after this?

Only if I wanted a master's degree.

I guess we can rule that out, eh? :P

(Just kidding.)

Oh no, we can rule it out.
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pjp
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PostPosted: Thu Apr 26, 2012 12:17 am    Post subject: Reply with quote

Could always go the MBA route, or some other Masters, should it be "required" at some point.
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BoneKracker
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PostPosted: Thu Apr 26, 2012 12:30 am    Post subject: Reply with quote

He'll go back for a Masters, but let him get through this first and then give him a couple years to recover. The nice thing about grad school is that you can begin to specialize. The percentage of shit you have to study that you have no interest in whatsoever gets smaller.
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pjp
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PostPosted: Thu Apr 26, 2012 12:35 am    Post subject: Reply with quote

Extraneous "do" I believe? (ah, never mind, major edit)

Also, before many can do, don't they first have to learn... from someone who teaches? Seems like one of those catch twenty-twos.
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BoneKracker
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PostPosted: Thu Apr 26, 2012 12:46 am    Post subject: Reply with quote

pjp wrote:
Extraneous "do" I believe? (ah, never mind, major edit)

Also, before many can do, don't they first have to learn... from someone who teaches? Seems like one of those catch twenty-twos.

For anyone wondering what he is babbling about, I had said, "Get a Masters in Education; those who can't do teach," but then deleted it.
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dmitchell
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PostPosted: Thu Apr 26, 2012 1:48 am    Post subject: Reply with quote

Teachers used to be highly respected professionals until unions and government destroyed the profession.
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