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Topic: Is (t^2-9)/(t-3) defined at t=3?
Replies: 166   Last Post: Oct 30, 2013 9:41 AM

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magidin@math.berkeley.edu

Posts: 11,158
Registered: 12/4/04
Re: Is (t^2-9)/(t-3) defined at t=3?
Posted: Oct 10, 2013 3:24 PM
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On Wednesday, October 9, 2013 4:51:11 PM UTC-5, fom wrote:
> On 10/9/2013 12:29 AM, Arturo Magidin wrote:
>

> >
>
> > Which just accomplishes the student lying to him or herself with the complicity of the professor who tells him its doable.
>
> >
>
> > Look: I don't object not telling a beginning student the whole truth; I **do** object telling him lies.
>
> >
>
> >
>
>
>
> Curious statement.
>
>
>
> Let me ask you about an actual situation.
>
>
>
> In the logic text I used as an undergraduate the notion of
>
> model had been introduced with respect to a "sentence" from
>
> a formal language.
>
>
>
> In Chang and Keisler, models apply to languages as a whole, and,
>
> a language is a list of uninterpreted parameters as in universal
>
> algebra.
>
>
>
> To be more clear concerning the first text, a "structure" is
>
> a "model" of a sentence if the sentence is "true with respect
>
> to a translation under the structure"
>
>
>
> Note that this is different from "true in a model" in the
>
> sense of Chang and Keisler.
>
>
>
> That is, a sentence may be true in a structure or
>
> a structure may be a model of a sentence.
>
>
>
> In my naivete, the latter suggests that an admissibility
>
> criterion applied to structures could influence something
>
> like the status of an independent statement. When one
>
> speaks of a model for a language, that notion does not
>
> suggest itself.
>
>
>
> Does this distinction appear legitimate to you?


I'm afraid I do not know enough about the topic to offer an informed opinion, and I confess I don't feel like trying to think through what you are describing at length right now.


> If so, has the student been told a lie?

From what you say, what you found *suggested* something to you that is inaccurate, but it did not actually make a false claim; the suggestion arose from your interpretation of what you were given, rather than being something you were explicitly told. If this is the case, then I would not interpret it as a lie.

--
Arturo Magidin


Date Subject Author
9/28/13
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Hetware
9/28/13
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Michael F. Stemper
9/28/13
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scattered
9/28/13
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Hetware
9/28/13
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quasi
9/28/13
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Hetware
9/28/13
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quasi
9/28/13
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Peter Percival
9/29/13
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quasi
9/28/13
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Hetware
9/28/13
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Richard Tobin
9/28/13
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Hetware
9/28/13
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tommyrjensen@gmail.com
9/29/13
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Hetware
10/6/13
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Hetware
10/6/13
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Peter Percival
10/6/13
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Hetware
10/6/13
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quasi
10/8/13
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quasi
10/7/13
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Peter Percival
9/29/13
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Michael F. Stemper
9/29/13
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Hetware
9/29/13
Read Re: Is (t^2-9)/(t-3) defined at t=3?
quasi
9/29/13
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Hetware
9/29/13
Read Re: Is (t^2-9)/(t-3) defined at t=3?
magidin@math.berkeley.edu
10/6/13
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Hetware
10/6/13
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magidin@math.berkeley.edu
10/7/13
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Hetware
10/7/13
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LudovicoVan
10/7/13
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Peter Percival
10/8/13
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magidin@math.berkeley.edu
10/12/13
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Hetware
10/12/13
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fom
10/13/13
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magidin@math.berkeley.edu
10/13/13
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Richard Tobin
10/13/13
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Hetware
10/13/13
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Peter Percival
10/13/13
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fom
10/13/13
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magidin@math.berkeley.edu
10/13/13
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magidin@math.berkeley.edu
10/8/13
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quasi
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magidin@math.berkeley.edu
10/8/13
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quasi
10/8/13
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quasi
10/12/13
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Hetware
10/13/13
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quasi
10/13/13
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Peter Percival
10/9/13
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magidin@math.berkeley.edu
10/9/13
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fom
10/10/13
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magidin@math.berkeley.edu
10/10/13
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fom
10/7/13
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Peter Percival
10/7/13
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Hetware
10/7/13
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fom
10/7/13
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Peter Percival
9/29/13
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quasi
9/30/13
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Peter Percival
9/30/13
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Peter Percival
9/30/13
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Peter Percival
9/30/13
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RGVickson@shaw.ca
9/30/13
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Roland Franzius
9/30/13
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9/30/13
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9/28/13
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Peter Percival
9/28/13
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Hetware
9/29/13
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Peter Percival
9/28/13
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Virgil
9/29/13
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quasi
9/29/13
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Virgil
9/29/13
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quasi
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9/29/13
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9/29/13
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quasi
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Virgil
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magidin@math.berkeley.edu
9/29/13
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Peter Percival
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FredJeffries@gmail.com
9/30/13
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10/6/13
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Hetware
10/6/13
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Peter Percival
10/6/13
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Peter Percival
10/6/13
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magidin@math.berkeley.edu
10/6/13
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Peter Percival
10/6/13
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David Bernier
9/29/13
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9/28/13
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Hetware
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Richard Tobin
9/30/13
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Ciekaw
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9/30/13
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LudovicoVan
10/6/13
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Hetware
10/7/13
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10/7/13
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David Bernier
10/7/13
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Hetware
10/7/13
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LudovicoVan
10/8/13
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Hetware
10/9/13
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10/9/13
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Richard Tobin
10/7/13
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Peter Percival
10/8/13
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Hetware
10/8/13
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Virgil
10/8/13
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Hetware
10/9/13
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magidin@math.berkeley.edu
10/9/13
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Peter Percival
10/10/13
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Ciekaw
10/9/13
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10/10/13
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Tim Golden BandTech.com
10/13/13
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Hetware
10/13/13
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Peter Percival
10/13/13
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Hetware
10/14/13
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Peter Percival
10/13/13
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Hetware
10/13/13
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fom
10/13/13
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Hetware
10/13/13
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fom
10/14/13
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fom
10/14/13
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Hetware
10/14/13
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magidin@math.berkeley.edu
10/14/13
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magidin@math.berkeley.edu
10/14/13
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Peter Percival
10/14/13
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Hetware
10/14/13
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quasi
10/16/13
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@less@ndro
10/16/13
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quasi
10/19/13
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Hetware
10/19/13
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quasi
10/19/13
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Hetware
10/20/13
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fom
10/20/13
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quasi
10/20/13
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Hetware
10/20/13
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fom
10/20/13
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Hetware
10/20/13
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Peter Percival
10/20/13
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Richard Tobin
10/20/13
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Hetware
10/30/13
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@less@ndro
10/19/13
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Hetware
10/10/13
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Ronald Benedik
10/10/13
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Peter Percival
10/10/13
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Virgil
10/18/13
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Hetware
10/19/13
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Peter Percival
10/19/13
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fom
10/19/13
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Peter Percival
10/19/13
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Hetware
10/19/13
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Peter Percival
10/19/13
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Hetware
10/19/13
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fom
10/19/13
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magidin@math.berkeley.edu
10/19/13
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Hetware
10/19/13
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magidin@math.berkeley.edu
10/20/13
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Hetware
10/20/13
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quasi
10/20/13
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quasi
10/20/13
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Hetware
10/20/13
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Peter Percival
10/20/13
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magidin@math.berkeley.edu
10/20/13
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Hetware
10/20/13
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Arturo Magidin
10/20/13
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Hetware
10/20/13
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magidin@math.berkeley.edu
10/19/13
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fom

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