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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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Hetware

Posts: 148
Registered: 4/13/13
Re: Is (t^2-9)/(t-3) defined at t=3?
Posted: Sep 29, 2013 7:44 PM
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On 9/28/2013 11:21 PM, tommyrjensen@gmail.com wrote:
> On Sunday, September 29, 2013 6:20:58 AM UTC+9, Hetware wrote:
>

>>
>>
>> I believe most mathematicians solving for x as a function of t given
>>
>>
>>
>> t^2 - 9 = x (t - 3)
>>
>>
>>
>> would not hesitate to factor the left hand side and divide both sides by
>>
>> t - 3 without treating t = 3 as a special case.

>
> Of course the solutions to t^2 - 9 = x (t - 3) are all points
> in the set { (x,t) ; t = x-3 or t = 3 }, the union of two straight
> lines in the plane. Why would any mathematician ignore half of all
> the solutions?
>


I said to solve for x as a function of t. I should have also have added
x!=0.




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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Hetware
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Hetware
9/28/13
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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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10/7/13
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9/29/13
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Michael F. Stemper
9/29/13
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Hetware
9/29/13
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quasi
9/29/13
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Hetware
9/29/13
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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
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LudovicoVan
10/7/13
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Peter Percival
10/8/13
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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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10/13/13
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fom
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magidin@math.berkeley.edu
10/13/13
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10/8/13
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fom
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fom
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Hetware
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9/29/13
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quasi
9/30/13
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Peter Percival
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9/28/13
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Hetware
9/29/13
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Virgil
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Virgil
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Hetware
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10/9/13
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10/9/13
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Peter Percival
10/10/13
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Ciekaw
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10/13/13
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Hetware
10/13/13
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10/13/13
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10/14/13
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10/13/13
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10/14/13
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Hetware
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10/14/13
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10/14/13
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10/16/13
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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
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Hetware
10/20/13
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fom
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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
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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
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10/19/13
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